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Diffstat (limited to 'googletest/include/gtest/gtest-printers.h')
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diff --git a/googletest/include/gtest/gtest-printers.h b/googletest/include/gtest/gtest-printers.h new file mode 100644 index 0000000..51865f8 --- /dev/null +++ b/googletest/include/gtest/gtest-printers.h @@ -0,0 +1,1107 @@ +// Copyright 2007, Google Inc. +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + +// Google Test - The Google C++ Testing and Mocking Framework +// +// This file implements a universal value printer that can print a +// value of any type T: +// +// void ::testing::internal::UniversalPrinter<T>::Print(value, ostream_ptr); +// +// A user can teach this function how to print a class type T by +// defining either operator<<() or PrintTo() in the namespace that +// defines T. More specifically, the FIRST defined function in the +// following list will be used (assuming T is defined in namespace +// foo): +// +// 1. foo::PrintTo(const T&, ostream*) +// 2. operator<<(ostream&, const T&) defined in either foo or the +// global namespace. +// +// However if T is an STL-style container then it is printed element-wise +// unless foo::PrintTo(const T&, ostream*) is defined. Note that +// operator<<() is ignored for container types. +// +// If none of the above is defined, it will print the debug string of +// the value if it is a protocol buffer, or print the raw bytes in the +// value otherwise. +// +// To aid debugging: when T is a reference type, the address of the +// value is also printed; when T is a (const) char pointer, both the +// pointer value and the NUL-terminated string it points to are +// printed. +// +// We also provide some convenient wrappers: +// +// // Prints a value to a string. For a (const or not) char +// // pointer, the NUL-terminated string (but not the pointer) is +// // printed. +// std::string ::testing::PrintToString(const T& value); +// +// // Prints a value tersely: for a reference type, the referenced +// // value (but not the address) is printed; for a (const or not) char +// // pointer, the NUL-terminated string (but not the pointer) is +// // printed. +// void ::testing::internal::UniversalTersePrint(const T& value, ostream*); +// +// // Prints value using the type inferred by the compiler. The difference +// // from UniversalTersePrint() is that this function prints both the +// // pointer and the NUL-terminated string for a (const or not) char pointer. +// void ::testing::internal::UniversalPrint(const T& value, ostream*); +// +// // Prints the fields of a tuple tersely to a string vector, one +// // element for each field. Tuple support must be enabled in +// // gtest-port.h. +// std::vector<string> UniversalTersePrintTupleFieldsToStrings( +// const Tuple& value); +// +// Known limitation: +// +// The print primitives print the elements of an STL-style container +// using the compiler-inferred type of *iter where iter is a +// const_iterator of the container. When const_iterator is an input +// iterator but not a forward iterator, this inferred type may not +// match value_type, and the print output may be incorrect. In +// practice, this is rarely a problem as for most containers +// const_iterator is a forward iterator. We'll fix this if there's an +// actual need for it. Note that this fix cannot rely on value_type +// being defined as many user-defined container types don't have +// value_type. + +// GOOGLETEST_CM0001 DO NOT DELETE + +#ifndef GTEST_INCLUDE_GTEST_GTEST_PRINTERS_H_ +#define GTEST_INCLUDE_GTEST_GTEST_PRINTERS_H_ + +#include <ostream> // NOLINT +#include <sstream> +#include <string> +#include <utility> +#include <vector> +#include "gtest/internal/gtest-port.h" +#include "gtest/internal/gtest-internal.h" + +#if GTEST_HAS_STD_TUPLE_ +# include <tuple> +#endif + +#if GTEST_HAS_ABSL +#include "absl/strings/string_view.h" +#include "absl/types/optional.h" +#include "absl/types/variant.h" +#endif // GTEST_HAS_ABSL + +namespace testing { + +// Definitions in the 'internal' and 'internal2' name spaces are +// subject to change without notice. DO NOT USE THEM IN USER CODE! +namespace internal2 { + +// Prints the given number of bytes in the given object to the given +// ostream. +GTEST_API_ void PrintBytesInObjectTo(const unsigned char* obj_bytes, + size_t count, + ::std::ostream* os); + +// For selecting which printer to use when a given type has neither << +// nor PrintTo(). +enum TypeKind { + kProtobuf, // a protobuf type + kConvertibleToInteger, // a type implicitly convertible to BiggestInt + // (e.g. a named or unnamed enum type) +#if GTEST_HAS_ABSL + kConvertibleToStringView, // a type implicitly convertible to + // absl::string_view +#endif + kOtherType // anything else +}; + +// TypeWithoutFormatter<T, kTypeKind>::PrintValue(value, os) is called +// by the universal printer to print a value of type T when neither +// operator<< nor PrintTo() is defined for T, where kTypeKind is the +// "kind" of T as defined by enum TypeKind. +template <typename T, TypeKind kTypeKind> +class TypeWithoutFormatter { + public: + // This default version is called when kTypeKind is kOtherType. + static void PrintValue(const T& value, ::std::ostream* os) { + PrintBytesInObjectTo(static_cast<const unsigned char*>( + reinterpret_cast<const void*>(&value)), + sizeof(value), os); + } +}; + +// We print a protobuf using its ShortDebugString() when the string +// doesn't exceed this many characters; otherwise we print it using +// DebugString() for better readability. +const size_t kProtobufOneLinerMaxLength = 50; + +template <typename T> +class TypeWithoutFormatter<T, kProtobuf> { + public: + static void PrintValue(const T& value, ::std::ostream* os) { + std::string pretty_str = value.ShortDebugString(); + if (pretty_str.length() > kProtobufOneLinerMaxLength) { + pretty_str = "\n" + value.DebugString(); + } + *os << ("<" + pretty_str + ">"); + } +}; + +template <typename T> +class TypeWithoutFormatter<T, kConvertibleToInteger> { + public: + // Since T has no << operator or PrintTo() but can be implicitly + // converted to BiggestInt, we print it as a BiggestInt. + // + // Most likely T is an enum type (either named or unnamed), in which + // case printing it as an integer is the desired behavior. In case + // T is not an enum, printing it as an integer is the best we can do + // given that it has no user-defined printer. + static void PrintValue(const T& value, ::std::ostream* os) { + const internal::BiggestInt kBigInt = value; + *os << kBigInt; + } +}; + +#if GTEST_HAS_ABSL +template <typename T> +class TypeWithoutFormatter<T, kConvertibleToStringView> { + public: + // Since T has neither operator<< nor PrintTo() but can be implicitly + // converted to absl::string_view, we print it as a absl::string_view. + // + // Note: the implementation is further below, as it depends on + // internal::PrintTo symbol which is defined later in the file. + static void PrintValue(const T& value, ::std::ostream* os); +}; +#endif + +// Prints the given value to the given ostream. If the value is a +// protocol message, its debug string is printed; if it's an enum or +// of a type implicitly convertible to BiggestInt, it's printed as an +// integer; otherwise the bytes in the value are printed. This is +// what UniversalPrinter<T>::Print() does when it knows nothing about +// type T and T has neither << operator nor PrintTo(). +// +// A user can override this behavior for a class type Foo by defining +// a << operator in the namespace where Foo is defined. +// +// We put this operator in namespace 'internal2' instead of 'internal' +// to simplify the implementation, as much code in 'internal' needs to +// use << in STL, which would conflict with our own << were it defined +// in 'internal'. +// +// Note that this operator<< takes a generic std::basic_ostream<Char, +// CharTraits> type instead of the more restricted std::ostream. If +// we define it to take an std::ostream instead, we'll get an +// "ambiguous overloads" compiler error when trying to print a type +// Foo that supports streaming to std::basic_ostream<Char, +// CharTraits>, as the compiler cannot tell whether +// operator<<(std::ostream&, const T&) or +// operator<<(std::basic_stream<Char, CharTraits>, const Foo&) is more +// specific. +template <typename Char, typename CharTraits, typename T> +::std::basic_ostream<Char, CharTraits>& operator<<( + ::std::basic_ostream<Char, CharTraits>& os, const T& x) { + TypeWithoutFormatter<T, (internal::IsAProtocolMessage<T>::value + ? kProtobuf + : internal::ImplicitlyConvertible< + const T&, internal::BiggestInt>::value + ? kConvertibleToInteger + : +#if GTEST_HAS_ABSL + internal::ImplicitlyConvertible< + const T&, absl::string_view>::value + ? kConvertibleToStringView + : +#endif + kOtherType)>::PrintValue(x, &os); + return os; +} + +} // namespace internal2 +} // namespace testing + +// This namespace MUST NOT BE NESTED IN ::testing, or the name look-up +// magic needed for implementing UniversalPrinter won't work. +namespace testing_internal { + +// Used to print a value that is not an STL-style container when the +// user doesn't define PrintTo() for it. +template <typename T> +void DefaultPrintNonContainerTo(const T& value, ::std::ostream* os) { + // With the following statement, during unqualified name lookup, + // testing::internal2::operator<< appears as if it was declared in + // the nearest enclosing namespace that contains both + // ::testing_internal and ::testing::internal2, i.e. the global + // namespace. For more details, refer to the C++ Standard section + // 7.3.4-1 [namespace.udir]. This allows us to fall back onto + // testing::internal2::operator<< in case T doesn't come with a << + // operator. + // + // We cannot write 'using ::testing::internal2::operator<<;', which + // gcc 3.3 fails to compile due to a compiler bug. + using namespace ::testing::internal2; // NOLINT + + // Assuming T is defined in namespace foo, in the next statement, + // the compiler will consider all of: + // + // 1. foo::operator<< (thanks to Koenig look-up), + // 2. ::operator<< (as the current namespace is enclosed in ::), + // 3. testing::internal2::operator<< (thanks to the using statement above). + // + // The operator<< whose type matches T best will be picked. + // + // We deliberately allow #2 to be a candidate, as sometimes it's + // impossible to define #1 (e.g. when foo is ::std, defining + // anything in it is undefined behavior unless you are a compiler + // vendor.). + *os << value; +} + +} // namespace testing_internal + +namespace testing { +namespace internal { + +// FormatForComparison<ToPrint, OtherOperand>::Format(value) formats a +// value of type ToPrint that is an operand of a comparison assertion +// (e.g. ASSERT_EQ). OtherOperand is the type of the other operand in +// the comparison, and is used to help determine the best way to +// format the value. In particular, when the value is a C string +// (char pointer) and the other operand is an STL string object, we +// want to format the C string as a string, since we know it is +// compared by value with the string object. If the value is a char +// pointer but the other operand is not an STL string object, we don't +// know whether the pointer is supposed to point to a NUL-terminated +// string, and thus want to print it as a pointer to be safe. +// +// INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM. + +// The default case. +template <typename ToPrint, typename OtherOperand> +class FormatForComparison { + public: + static ::std::string Format(const ToPrint& value) { + return ::testing::PrintToString(value); + } +}; + +// Array. +template <typename ToPrint, size_t N, typename OtherOperand> +class FormatForComparison<ToPrint[N], OtherOperand> { + public: + static ::std::string Format(const ToPrint* value) { + return FormatForComparison<const ToPrint*, OtherOperand>::Format(value); + } +}; + +// By default, print C string as pointers to be safe, as we don't know +// whether they actually point to a NUL-terminated string. + +#define GTEST_IMPL_FORMAT_C_STRING_AS_POINTER_(CharType) \ + template <typename OtherOperand> \ + class FormatForComparison<CharType*, OtherOperand> { \ + public: \ + static ::std::string Format(CharType* value) { \ + return ::testing::PrintToString(static_cast<const void*>(value)); \ + } \ + } + +GTEST_IMPL_FORMAT_C_STRING_AS_POINTER_(char); +GTEST_IMPL_FORMAT_C_STRING_AS_POINTER_(const char); +GTEST_IMPL_FORMAT_C_STRING_AS_POINTER_(wchar_t); +GTEST_IMPL_FORMAT_C_STRING_AS_POINTER_(const wchar_t); + +#undef GTEST_IMPL_FORMAT_C_STRING_AS_POINTER_ + +// If a C string is compared with an STL string object, we know it's meant +// to point to a NUL-terminated string, and thus can print it as a string. + +#define GTEST_IMPL_FORMAT_C_STRING_AS_STRING_(CharType, OtherStringType) \ + template <> \ + class FormatForComparison<CharType*, OtherStringType> { \ + public: \ + static ::std::string Format(CharType* value) { \ + return ::testing::PrintToString(value); \ + } \ + } + +GTEST_IMPL_FORMAT_C_STRING_AS_STRING_(char, ::std::string); +GTEST_IMPL_FORMAT_C_STRING_AS_STRING_(const char, ::std::string); + +#if GTEST_HAS_GLOBAL_STRING +GTEST_IMPL_FORMAT_C_STRING_AS_STRING_(char, ::string); +GTEST_IMPL_FORMAT_C_STRING_AS_STRING_(const char, ::string); +#endif + +#if GTEST_HAS_GLOBAL_WSTRING +GTEST_IMPL_FORMAT_C_STRING_AS_STRING_(wchar_t, ::wstring); +GTEST_IMPL_FORMAT_C_STRING_AS_STRING_(const wchar_t, ::wstring); +#endif + +#if GTEST_HAS_STD_WSTRING +GTEST_IMPL_FORMAT_C_STRING_AS_STRING_(wchar_t, ::std::wstring); +GTEST_IMPL_FORMAT_C_STRING_AS_STRING_(const wchar_t, ::std::wstring); +#endif + +#undef GTEST_IMPL_FORMAT_C_STRING_AS_STRING_ + +// Formats a comparison assertion (e.g. ASSERT_EQ, EXPECT_LT, and etc) +// operand to be used in a failure message. The type (but not value) +// of the other operand may affect the format. This allows us to +// print a char* as a raw pointer when it is compared against another +// char* or void*, and print it as a C string when it is compared +// against an std::string object, for example. +// +// INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM. +template <typename T1, typename T2> +std::string FormatForComparisonFailureMessage( + const T1& value, const T2& /* other_operand */) { + return FormatForComparison<T1, T2>::Format(value); +} + +// UniversalPrinter<T>::Print(value, ostream_ptr) prints the given +// value to the given ostream. The caller must ensure that +// 'ostream_ptr' is not NULL, or the behavior is undefined. +// +// We define UniversalPrinter as a class template (as opposed to a +// function template), as we need to partially specialize it for +// reference types, which cannot be done with function templates. +template <typename T> +class UniversalPrinter; + +template <typename T> +void UniversalPrint(const T& value, ::std::ostream* os); + +enum DefaultPrinterType { + kPrintContainer, + kPrintPointer, + kPrintFunctionPointer, + kPrintOther, +}; +template <DefaultPrinterType type> struct WrapPrinterType {}; + +// Used to print an STL-style container when the user doesn't define +// a PrintTo() for it. +template <typename C> +void DefaultPrintTo(WrapPrinterType<kPrintContainer> /* dummy */, + const C& container, ::std::ostream* os) { + const size_t kMaxCount = 32; // The maximum number of elements to print. + *os << '{'; + size_t count = 0; + for (typename C::const_iterator it = container.begin(); + it != container.end(); ++it, ++count) { + if (count > 0) { + *os << ','; + if (count == kMaxCount) { // Enough has been printed. + *os << " ..."; + break; + } + } + *os << ' '; + // We cannot call PrintTo(*it, os) here as PrintTo() doesn't + // handle *it being a native array. + internal::UniversalPrint(*it, os); + } + + if (count > 0) { + *os << ' '; + } + *os << '}'; +} + +// Used to print a pointer that is neither a char pointer nor a member +// pointer, when the user doesn't define PrintTo() for it. (A member +// variable pointer or member function pointer doesn't really point to +// a location in the address space. Their representation is +// implementation-defined. Therefore they will be printed as raw +// bytes.) +template <typename T> +void DefaultPrintTo(WrapPrinterType<kPrintPointer> /* dummy */, + T* p, ::std::ostream* os) { + if (p == NULL) { + *os << "NULL"; + } else { + // T is not a function type. We just call << to print p, + // relying on ADL to pick up user-defined << for their pointer + // types, if any. + *os << p; + } +} +template <typename T> +void DefaultPrintTo(WrapPrinterType<kPrintFunctionPointer> /* dummy */, + T* p, ::std::ostream* os) { + if (p == NULL) { + *os << "NULL"; + } else { + // T is a function type, so '*os << p' doesn't do what we want + // (it just prints p as bool). We want to print p as a const + // void*. + *os << reinterpret_cast<const void*>(p); + } +} + +// Used to print a non-container, non-pointer value when the user +// doesn't define PrintTo() for it. +template <typename T> +void DefaultPrintTo(WrapPrinterType<kPrintOther> /* dummy */, + const T& value, ::std::ostream* os) { + ::testing_internal::DefaultPrintNonContainerTo(value, os); +} + +// Prints the given value using the << operator if it has one; +// otherwise prints the bytes in it. This is what +// UniversalPrinter<T>::Print() does when PrintTo() is not specialized +// or overloaded for type T. +// +// A user can override this behavior for a class type Foo by defining +// an overload of PrintTo() in the namespace where Foo is defined. We +// give the user this option as sometimes defining a << operator for +// Foo is not desirable (e.g. the coding style may prevent doing it, +// or there is already a << operator but it doesn't do what the user +// wants). +template <typename T> +void PrintTo(const T& value, ::std::ostream* os) { + // DefaultPrintTo() is overloaded. The type of its first argument + // determines which version will be picked. + // + // Note that we check for container types here, prior to we check + // for protocol message types in our operator<<. The rationale is: + // + // For protocol messages, we want to give people a chance to + // override Google Mock's format by defining a PrintTo() or + // operator<<. For STL containers, other formats can be + // incompatible with Google Mock's format for the container + // elements; therefore we check for container types here to ensure + // that our format is used. + // + // Note that MSVC and clang-cl do allow an implicit conversion from + // pointer-to-function to pointer-to-object, but clang-cl warns on it. + // So don't use ImplicitlyConvertible if it can be helped since it will + // cause this warning, and use a separate overload of DefaultPrintTo for + // function pointers so that the `*os << p` in the object pointer overload + // doesn't cause that warning either. + DefaultPrintTo( + WrapPrinterType < + (sizeof(IsContainerTest<T>(0)) == sizeof(IsContainer)) && + !IsRecursiveContainer<T>::value + ? kPrintContainer + : !is_pointer<T>::value + ? kPrintOther +#if GTEST_LANG_CXX11 + : std::is_function<typename std::remove_pointer<T>::type>::value +#else + : !internal::ImplicitlyConvertible<T, const void*>::value +#endif + ? kPrintFunctionPointer + : kPrintPointer > (), + value, os); +} + +// The following list of PrintTo() overloads tells +// UniversalPrinter<T>::Print() how to print standard types (built-in +// types, strings, plain arrays, and pointers). + +// Overloads for various char types. +GTEST_API_ void PrintTo(unsigned char c, ::std::ostream* os); +GTEST_API_ void PrintTo(signed char c, ::std::ostream* os); +inline void PrintTo(char c, ::std::ostream* os) { + // When printing a plain char, we always treat it as unsigned. This + // way, the output won't be affected by whether the compiler thinks + // char is signed or not. + PrintTo(static_cast<unsigned char>(c), os); +} + +// Overloads for other simple built-in types. +inline void PrintTo(bool x, ::std::ostream* os) { + *os << (x ? "true" : "false"); +} + +// Overload for wchar_t type. +// Prints a wchar_t as a symbol if it is printable or as its internal +// code otherwise and also as its decimal code (except for L'\0'). +// The L'\0' char is printed as "L'\\0'". The decimal code is printed +// as signed integer when wchar_t is implemented by the compiler +// as a signed type and is printed as an unsigned integer when wchar_t +// is implemented as an unsigned type. +GTEST_API_ void PrintTo(wchar_t wc, ::std::ostream* os); + +// Overloads for C strings. +GTEST_API_ void PrintTo(const char* s, ::std::ostream* os); +inline void PrintTo(char* s, ::std::ostream* os) { + PrintTo(ImplicitCast_<const char*>(s), os); +} + +// signed/unsigned char is often used for representing binary data, so +// we print pointers to it as void* to be safe. +inline void PrintTo(const signed char* s, ::std::ostream* os) { + PrintTo(ImplicitCast_<const void*>(s), os); +} +inline void PrintTo(signed char* s, ::std::ostream* os) { + PrintTo(ImplicitCast_<const void*>(s), os); +} +inline void PrintTo(const unsigned char* s, ::std::ostream* os) { + PrintTo(ImplicitCast_<const void*>(s), os); +} +inline void PrintTo(unsigned char* s, ::std::ostream* os) { + PrintTo(ImplicitCast_<const void*>(s), os); +} + +// MSVC can be configured to define wchar_t as a typedef of unsigned +// short. It defines _NATIVE_WCHAR_T_DEFINED when wchar_t is a native +// type. When wchar_t is a typedef, defining an overload for const +// wchar_t* would cause unsigned short* be printed as a wide string, +// possibly causing invalid memory accesses. +#if !defined(_MSC_VER) || defined(_NATIVE_WCHAR_T_DEFINED) +// Overloads for wide C strings +GTEST_API_ void PrintTo(const wchar_t* s, ::std::ostream* os); +inline void PrintTo(wchar_t* s, ::std::ostream* os) { + PrintTo(ImplicitCast_<const wchar_t*>(s), os); +} +#endif + +// Overload for C arrays. Multi-dimensional arrays are printed +// properly. + +// Prints the given number of elements in an array, without printing +// the curly braces. +template <typename T> +void PrintRawArrayTo(const T a[], size_t count, ::std::ostream* os) { + UniversalPrint(a[0], os); + for (size_t i = 1; i != count; i++) { + *os << ", "; + UniversalPrint(a[i], os); + } +} + +// Overloads for ::string and ::std::string. +#if GTEST_HAS_GLOBAL_STRING +GTEST_API_ void PrintStringTo(const ::string&s, ::std::ostream* os); +inline void PrintTo(const ::string& s, ::std::ostream* os) { + PrintStringTo(s, os); +} +#endif // GTEST_HAS_GLOBAL_STRING + +GTEST_API_ void PrintStringTo(const ::std::string&s, ::std::ostream* os); +inline void PrintTo(const ::std::string& s, ::std::ostream* os) { + PrintStringTo(s, os); +} + +// Overloads for ::wstring and ::std::wstring. +#if GTEST_HAS_GLOBAL_WSTRING +GTEST_API_ void PrintWideStringTo(const ::wstring&s, ::std::ostream* os); +inline void PrintTo(const ::wstring& s, ::std::ostream* os) { + PrintWideStringTo(s, os); +} +#endif // GTEST_HAS_GLOBAL_WSTRING + +#if GTEST_HAS_STD_WSTRING +GTEST_API_ void PrintWideStringTo(const ::std::wstring&s, ::std::ostream* os); +inline void PrintTo(const ::std::wstring& s, ::std::ostream* os) { + PrintWideStringTo(s, os); +} +#endif // GTEST_HAS_STD_WSTRING + +#if GTEST_HAS_ABSL +// Overload for absl::string_view. +inline void PrintTo(absl::string_view sp, ::std::ostream* os) { + PrintTo(::std::string(sp), os); +} +#endif // GTEST_HAS_ABSL + +#if GTEST_LANG_CXX11 +inline void PrintTo(std::nullptr_t, ::std::ostream* os) { *os << "(nullptr)"; } +#endif // GTEST_LANG_CXX11 + +#if GTEST_HAS_TR1_TUPLE || GTEST_HAS_STD_TUPLE_ +// Helper function for printing a tuple. T must be instantiated with +// a tuple type. +template <typename T> +void PrintTupleTo(const T& t, ::std::ostream* os); +#endif // GTEST_HAS_TR1_TUPLE || GTEST_HAS_STD_TUPLE_ + +#if GTEST_HAS_TR1_TUPLE +// Overload for ::std::tr1::tuple. Needed for printing function arguments, +// which are packed as tuples. + +// Overloaded PrintTo() for tuples of various arities. We support +// tuples of up-to 10 fields. The following implementation works +// regardless of whether tr1::tuple is implemented using the +// non-standard variadic template feature or not. + +inline void PrintTo(const ::std::tr1::tuple<>& t, ::std::ostream* os) { + PrintTupleTo(t, os); +} + +template <typename T1> +void PrintTo(const ::std::tr1::tuple<T1>& t, ::std::ostream* os) { + PrintTupleTo(t, os); +} + +template <typename T1, typename T2> +void PrintTo(const ::std::tr1::tuple<T1, T2>& t, ::std::ostream* os) { + PrintTupleTo(t, os); +} + +template <typename T1, typename T2, typename T3> +void PrintTo(const ::std::tr1::tuple<T1, T2, T3>& t, ::std::ostream* os) { + PrintTupleTo(t, os); +} + +template <typename T1, typename T2, typename T3, typename T4> +void PrintTo(const ::std::tr1::tuple<T1, T2, T3, T4>& t, ::std::ostream* os) { + PrintTupleTo(t, os); +} + +template <typename T1, typename T2, typename T3, typename T4, typename T5> +void PrintTo(const ::std::tr1::tuple<T1, T2, T3, T4, T5>& t, + ::std::ostream* os) { + PrintTupleTo(t, os); +} + +template <typename T1, typename T2, typename T3, typename T4, typename T5, + typename T6> +void PrintTo(const ::std::tr1::tuple<T1, T2, T3, T4, T5, T6>& t, + ::std::ostream* os) { + PrintTupleTo(t, os); +} + +template <typename T1, typename T2, typename T3, typename T4, typename T5, + typename T6, typename T7> +void PrintTo(const ::std::tr1::tuple<T1, T2, T3, T4, T5, T6, T7>& t, + ::std::ostream* os) { + PrintTupleTo(t, os); +} + +template <typename T1, typename T2, typename T3, typename T4, typename T5, + typename T6, typename T7, typename T8> +void PrintTo(const ::std::tr1::tuple<T1, T2, T3, T4, T5, T6, T7, T8>& t, + ::std::ostream* os) { + PrintTupleTo(t, os); +} + +template <typename T1, typename T2, typename T3, typename T4, typename T5, + typename T6, typename T7, typename T8, typename T9> +void PrintTo(const ::std::tr1::tuple<T1, T2, T3, T4, T5, T6, T7, T8, T9>& t, + ::std::ostream* os) { + PrintTupleTo(t, os); +} + +template <typename T1, typename T2, typename T3, typename T4, typename T5, + typename T6, typename T7, typename T8, typename T9, typename T10> +void PrintTo( + const ::std::tr1::tuple<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>& t, + ::std::ostream* os) { + PrintTupleTo(t, os); +} +#endif // GTEST_HAS_TR1_TUPLE + +#if GTEST_HAS_STD_TUPLE_ +template <typename... Types> +void PrintTo(const ::std::tuple<Types...>& t, ::std::ostream* os) { + PrintTupleTo(t, os); +} +#endif // GTEST_HAS_STD_TUPLE_ + +// Overload for std::pair. +template <typename T1, typename T2> +void PrintTo(const ::std::pair<T1, T2>& value, ::std::ostream* os) { + *os << '('; + // We cannot use UniversalPrint(value.first, os) here, as T1 may be + // a reference type. The same for printing value.second. + UniversalPrinter<T1>::Print(value.first, os); + *os << ", "; + UniversalPrinter<T2>::Print(value.second, os); + *os << ')'; +} + +// Implements printing a non-reference type T by letting the compiler +// pick the right overload of PrintTo() for T. +template <typename T> +class UniversalPrinter { + public: + // MSVC warns about adding const to a function type, so we want to + // disable the warning. + GTEST_DISABLE_MSC_WARNINGS_PUSH_(4180) + + // Note: we deliberately don't call this PrintTo(), as that name + // conflicts with ::testing::internal::PrintTo in the body of the + // function. + static void Print(const T& value, ::std::ostream* os) { + // By default, ::testing::internal::PrintTo() is used for printing + // the value. + // + // Thanks to Koenig look-up, if T is a class and has its own + // PrintTo() function defined in its namespace, that function will + // be visible here. Since it is more specific than the generic ones + // in ::testing::internal, it will be picked by the compiler in the + // following statement - exactly what we want. + PrintTo(value, os); + } + + GTEST_DISABLE_MSC_WARNINGS_POP_() +}; + +#if GTEST_HAS_ABSL + +// Printer for absl::optional + +template <typename T> +class UniversalPrinter<::absl::optional<T>> { + public: + static void Print(const ::absl::optional<T>& value, ::std::ostream* os) { + *os << '('; + if (!value) { + *os << "nullopt"; + } else { + UniversalPrint(*value, os); + } + *os << ')'; + } +}; + +// Printer for absl::variant + +template <typename... T> +class UniversalPrinter<::absl::variant<T...>> { + public: + static void Print(const ::absl::variant<T...>& value, ::std::ostream* os) { + *os << '('; + absl::visit(Visitor{os}, value); + *os << ')'; + } + + private: + struct Visitor { + template <typename U> + void operator()(const U& u) const { + *os << "'" << GetTypeName<U>() << "' with value "; + UniversalPrint(u, os); + } + ::std::ostream* os; + }; +}; + +#endif // GTEST_HAS_ABSL + +// UniversalPrintArray(begin, len, os) prints an array of 'len' +// elements, starting at address 'begin'. +template <typename T> +void UniversalPrintArray(const T* begin, size_t len, ::std::ostream* os) { + if (len == 0) { + *os << "{}"; + } else { + *os << "{ "; + const size_t kThreshold = 18; + const size_t kChunkSize = 8; + // If the array has more than kThreshold elements, we'll have to + // omit some details by printing only the first and the last + // kChunkSize elements. + // FIXME: let the user control the threshold using a flag. + if (len <= kThreshold) { + PrintRawArrayTo(begin, len, os); + } else { + PrintRawArrayTo(begin, kChunkSize, os); + *os << ", ..., "; + PrintRawArrayTo(begin + len - kChunkSize, kChunkSize, os); + } + *os << " }"; + } +} +// This overload prints a (const) char array compactly. +GTEST_API_ void UniversalPrintArray( + const char* begin, size_t len, ::std::ostream* os); + +// This overload prints a (const) wchar_t array compactly. +GTEST_API_ void UniversalPrintArray( + const wchar_t* begin, size_t len, ::std::ostream* os); + +// Implements printing an array type T[N]. +template <typename T, size_t N> +class UniversalPrinter<T[N]> { + public: + // Prints the given array, omitting some elements when there are too + // many. + static void Print(const T (&a)[N], ::std::ostream* os) { + UniversalPrintArray(a, N, os); + } +}; + +// Implements printing a reference type T&. +template <typename T> +class UniversalPrinter<T&> { + public: + // MSVC warns about adding const to a function type, so we want to + // disable the warning. + GTEST_DISABLE_MSC_WARNINGS_PUSH_(4180) + + static void Print(const T& value, ::std::ostream* os) { + // Prints the address of the value. We use reinterpret_cast here + // as static_cast doesn't compile when T is a function type. + *os << "@" << reinterpret_cast<const void*>(&value) << " "; + + // Then prints the value itself. + UniversalPrint(value, os); + } + + GTEST_DISABLE_MSC_WARNINGS_POP_() +}; + +// Prints a value tersely: for a reference type, the referenced value +// (but not the address) is printed; for a (const) char pointer, the +// NUL-terminated string (but not the pointer) is printed. + +template <typename T> +class UniversalTersePrinter { + public: + static void Print(const T& value, ::std::ostream* os) { + UniversalPrint(value, os); + } +}; +template <typename T> +class UniversalTersePrinter<T&> { + public: + static void Print(const T& value, ::std::ostream* os) { + UniversalPrint(value, os); + } +}; +template <typename T, size_t N> +class UniversalTersePrinter<T[N]> { + public: + static void Print(const T (&value)[N], ::std::ostream* os) { + UniversalPrinter<T[N]>::Print(value, os); + } +}; +template <> +class UniversalTersePrinter<const char*> { + public: + static void Print(const char* str, ::std::ostream* os) { + if (str == NULL) { + *os << "NULL"; + } else { + UniversalPrint(std::string(str), os); + } + } +}; +template <> +class UniversalTersePrinter<char*> { + public: + static void Print(char* str, ::std::ostream* os) { + UniversalTersePrinter<const char*>::Print(str, os); + } +}; + +#if GTEST_HAS_STD_WSTRING +template <> +class UniversalTersePrinter<const wchar_t*> { + public: + static void Print(const wchar_t* str, ::std::ostream* os) { + if (str == NULL) { + *os << "NULL"; + } else { + UniversalPrint(::std::wstring(str), os); + } + } +}; +#endif + +template <> +class UniversalTersePrinter<wchar_t*> { + public: + static void Print(wchar_t* str, ::std::ostream* os) { + UniversalTersePrinter<const wchar_t*>::Print(str, os); + } +}; + +template <typename T> +void UniversalTersePrint(const T& value, ::std::ostream* os) { + UniversalTersePrinter<T>::Print(value, os); +} + +// Prints a value using the type inferred by the compiler. The +// difference between this and UniversalTersePrint() is that for a +// (const) char pointer, this prints both the pointer and the +// NUL-terminated string. +template <typename T> +void UniversalPrint(const T& value, ::std::ostream* os) { + // A workarond for the bug in VC++ 7.1 that prevents us from instantiating + // UniversalPrinter with T directly. + typedef T T1; + UniversalPrinter<T1>::Print(value, os); +} + +typedef ::std::vector< ::std::string> Strings; + +// TuplePolicy<TupleT> must provide: +// - tuple_size +// size of tuple TupleT. +// - get<size_t I>(const TupleT& t) +// static function extracting element I of tuple TupleT. +// - tuple_element<size_t I>::type +// type of element I of tuple TupleT. +template <typename TupleT> +struct TuplePolicy; + +#if GTEST_HAS_TR1_TUPLE +template <typename TupleT> +struct TuplePolicy { + typedef TupleT Tuple; + static const size_t tuple_size = ::std::tr1::tuple_size<Tuple>::value; + + template <size_t I> + struct tuple_element : ::std::tr1::tuple_element<static_cast<int>(I), Tuple> { + }; + + template <size_t I> + static typename AddReference<const typename ::std::tr1::tuple_element< + static_cast<int>(I), Tuple>::type>::type + get(const Tuple& tuple) { + return ::std::tr1::get<I>(tuple); + } +}; +template <typename TupleT> +const size_t TuplePolicy<TupleT>::tuple_size; +#endif // GTEST_HAS_TR1_TUPLE + +#if GTEST_HAS_STD_TUPLE_ +template <typename... Types> +struct TuplePolicy< ::std::tuple<Types...> > { + typedef ::std::tuple<Types...> Tuple; + static const size_t tuple_size = ::std::tuple_size<Tuple>::value; + + template <size_t I> + struct tuple_element : ::std::tuple_element<I, Tuple> {}; + + template <size_t I> + static const typename ::std::tuple_element<I, Tuple>::type& get( + const Tuple& tuple) { + return ::std::get<I>(tuple); + } +}; +template <typename... Types> +const size_t TuplePolicy< ::std::tuple<Types...> >::tuple_size; +#endif // GTEST_HAS_STD_TUPLE_ + +#if GTEST_HAS_TR1_TUPLE || GTEST_HAS_STD_TUPLE_ +// This helper template allows PrintTo() for tuples and +// UniversalTersePrintTupleFieldsToStrings() to be defined by +// induction on the number of tuple fields. The idea is that +// TuplePrefixPrinter<N>::PrintPrefixTo(t, os) prints the first N +// fields in tuple t, and can be defined in terms of +// TuplePrefixPrinter<N - 1>. +// +// The inductive case. +template <size_t N> +struct TuplePrefixPrinter { + // Prints the first N fields of a tuple. + template <typename Tuple> + static void PrintPrefixTo(const Tuple& t, ::std::ostream* os) { + TuplePrefixPrinter<N - 1>::PrintPrefixTo(t, os); + GTEST_INTENTIONAL_CONST_COND_PUSH_() + if (N > 1) { + GTEST_INTENTIONAL_CONST_COND_POP_() + *os << ", "; + } + UniversalPrinter< + typename TuplePolicy<Tuple>::template tuple_element<N - 1>::type> + ::Print(TuplePolicy<Tuple>::template get<N - 1>(t), os); + } + + // Tersely prints the first N fields of a tuple to a string vector, + // one element for each field. + template <typename Tuple> + static void TersePrintPrefixToStrings(const Tuple& t, Strings* strings) { + TuplePrefixPrinter<N - 1>::TersePrintPrefixToStrings(t, strings); + ::std::stringstream ss; + UniversalTersePrint(TuplePolicy<Tuple>::template get<N - 1>(t), &ss); + strings->push_back(ss.str()); + } +}; + +// Base case. +template <> +struct TuplePrefixPrinter<0> { + template <typename Tuple> + static void PrintPrefixTo(const Tuple&, ::std::ostream*) {} + + template <typename Tuple> + static void TersePrintPrefixToStrings(const Tuple&, Strings*) {} +}; + +// Helper function for printing a tuple. +// Tuple must be either std::tr1::tuple or std::tuple type. +template <typename Tuple> +void PrintTupleTo(const Tuple& t, ::std::ostream* os) { + *os << "("; + TuplePrefixPrinter<TuplePolicy<Tuple>::tuple_size>::PrintPrefixTo(t, os); + *os << ")"; +} + +// Prints the fields of a tuple tersely to a string vector, one +// element for each field. See the comment before +// UniversalTersePrint() for how we define "tersely". +template <typename Tuple> +Strings UniversalTersePrintTupleFieldsToStrings(const Tuple& value) { + Strings result; + TuplePrefixPrinter<TuplePolicy<Tuple>::tuple_size>:: + TersePrintPrefixToStrings(value, &result); + return result; +} +#endif // GTEST_HAS_TR1_TUPLE || GTEST_HAS_STD_TUPLE_ + +} // namespace internal + +#if GTEST_HAS_ABSL +namespace internal2 { +template <typename T> +void TypeWithoutFormatter<T, kConvertibleToStringView>::PrintValue( + const T& value, ::std::ostream* os) { + internal::PrintTo(absl::string_view(value), os); +} +} // namespace internal2 +#endif + +template <typename T> +::std::string PrintToString(const T& value) { + ::std::stringstream ss; + internal::UniversalTersePrinter<T>::Print(value, &ss); + return ss.str(); +} + +} // namespace testing + +// Include any custom printer added by the local installation. +// We must include this header at the end to make sure it can use the +// declarations from this file. +#include "gtest/internal/custom/gtest-printers.h" + +#endif // GTEST_INCLUDE_GTEST_GTEST_PRINTERS_H_ |