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Compile time checks for size of UTF-16 code units

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Nemanja Trifunovic 2025-01-11 11:09:19 -05:00
parent b26a5f718f
commit 65701fe007
1 changed files with 10 additions and 0 deletions
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10
source/utf8/core.h
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@ -43,9 +43,14 @@ DEALINGS IN THE SOFTWARE.
#if UTF_CPP_CPLUSPLUS >= 201103L // C++ 11 or later
#define UTF_CPP_OVERRIDE override
#define UTF_CPP_NOEXCEPT noexcept
#define UTF_CPP_STATIC_ASSERT(condition) static_assert(condition, "UTFCPP static assert");
#else // C++ 98/03
#define UTF_CPP_OVERRIDE
#define UTF_CPP_NOEXCEPT throw()
// Simulate static_assert:
template <bool Condition> struct StaticAssert {static void assert() {int static_assert_impl[(Condition ? 1 : -1)];} };
template <> struct StaticAssert<true> {static void assert() {}};
#define UTF_CPP_STATIC_ASSERT(condition) StaticAssert<condition>::assert();
#endif // C++ 11 or later
@ -308,6 +313,10 @@ namespace internal
template <typename word_iterator>
utf_error validate_next16(word_iterator& it, word_iterator end, utfchar32_t& code_point)
{
// Make sure the iterator dereferences a large enough type
typedef typename std::iterator_traits<word_iterator>::value_type word_type;
UTF_CPP_STATIC_ASSERT(sizeof(word_type) >= sizeof(utfchar16_t));
// Check the edge case:
if (it == end)
return NOT_ENOUGH_ROOM;
// Save the original value of it so we can go back in case of failure
@ -395,6 +404,7 @@ namespace internal
// the word_type.
template <typename word_iterator, typename word_type>
word_iterator append16(utfchar32_t cp, word_iterator result) {
UTF_CPP_STATIC_ASSERT(sizeof(word_type) >= sizeof(utfchar16_t));
if (is_in_bmp(cp))
*(result++) = static_cast<word_type>(cp);
else {