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//
// Reichwein.IT Unicode Library
//
// Predicates for Unicode characters
//
#pragma once
namespace unicode {
// Detection of a valid Unicode code point value. Independent of encoding.
//
// Note: This doesn't tell if the specified value is actually allocated in an
// existing Unicode version, but rather just detects if the value is inside
// allocatable range.
//
// bits_to_compare: limit bits to consider even further than defined by T
// T: usually, char32_t, uint32_t etc.
template<size_t bits_to_compare = 32, typename T>
static inline bool is_valid_unicode(const T& value) noexcept
{
if constexpr(sizeof(T) == 1 || bits_to_compare <= 15)
return true;
else if constexpr(sizeof(T) == 2 || bits_to_compare <= 20)
//return value <= 0xD7FF || value >= 0xE000;
return (value & 0xF800) != 0xD800;
else
//return (value & 0xFFFFF800) != 0x0000D800 && (value >> 16) <= 0x10;
return value <= 0xD7FF || (value >= 0xE000 && value <= 0x10FFFF);
}
} // namespace unicode
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