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authorRoland Reichwein <mail@reichwein.it>2022-01-02 16:44:47 +0100
committerRoland Reichwein <mail@reichwein.it>2022-01-02 16:44:47 +0100
commit7241d48ec4d0a0a59325d7a9208bdf5e076ba002 (patch)
treebc24c1bc573b3e820fecd59301754443db33980c /include/unicode/utf.h
parentac045216d6e7fcb0ec4d2169ac2b6dffbe21707a (diff)
Use [[likely]] and [[unlikely]]
Diffstat (limited to 'include/unicode/utf.h')
-rw-r--r--include/unicode/utf.h27
1 files changed, 23 insertions, 4 deletions
diff --git a/include/unicode/utf.h b/include/unicode/utf.h
index 046d9c6..6d7c2f7 100644
--- a/include/unicode/utf.h
+++ b/include/unicode/utf.h
@@ -58,9 +58,11 @@ namespace unicode::detail {
if ((((s[i] & 7) << 2) | ((s[i + 1] >> 4) & 3)) >= 0x11)
return false; // Unicode too big above 0x10FFFF
i += 4;
- } else {
+ } else
+#if __cplusplus >= 202002L
+ [[unlikely]]
+#endif
return false;
- }
}
return true;
}
@@ -91,9 +93,11 @@ namespace unicode::detail {
i++;
} else if ((i < size - 1) && is_utf16_sequence(s[i], s[i + 1])) {
i += 2;
- } else {
+ } else
+#if __cplusplus >= 202002L
+ [[unlikely]]
+#endif
return false;
- }
}
return true;
}
@@ -185,6 +189,9 @@ namespace unicode::detail {
if constexpr(sequence_length > 1) {
if (remaining_code_units() < sequence_length)
+#if __cplusplus >= 202002L
+ [[unlikely]]
+#endif
throw std::invalid_argument("Bad input: Not enough bytes left for decoding UTF-8 sequence");
}
@@ -192,6 +199,9 @@ namespace unicode::detail {
std::advance(iterator, sequence_length);
internal_type result{decode_utf8_sequence(bytes...)};
if (!unicode::is_valid_unicode<sequence_length * 6>(result))
+#if __cplusplus >= 202002L
+ [[unlikely]]
+#endif
throw std::invalid_argument("Invalid Unicode character: "s + std::to_string(static_cast<uint32_t>(result)));
return result;
} else {
@@ -218,10 +228,16 @@ namespace unicode::detail {
return unit0;
} else {
if (remaining_code_units() < 2)
+#if __cplusplus >= 202002L
+ [[unlikely]]
+#endif
throw std::invalid_argument("Bad input: Continuation of first UTF-16 unit missing");
char16_t unit1 {static_cast<char16_t>(get_code_unit<1>())};
if ((unit0 & 0xFC00) != 0xD800 || (unit1 & 0xFC00) != 0xDC00)
+#if __cplusplus >= 202002L
+ [[unlikely]]
+#endif
throw std::invalid_argument("Bad input: 2 malformed UTF-16 surrogates");
std::advance(iterator, 2);
@@ -235,6 +251,9 @@ namespace unicode::detail {
internal_type result {static_cast<internal_type>(get_code_unit<0>())};
if (!unicode::is_valid_unicode(result))
+#if __cplusplus >= 202002L
+ [[unlikely]]
+#endif
throw std::invalid_argument("Invalid Unicode character: "s + std::to_string(static_cast<uint32_t>(result)));
std::advance(iterator, 1);