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Fix ADL lookup for memory_buffer

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This commit is contained in:
Victor Zverovich
2025-05-26 09:44:35 -07:00
parent 8aa1d6a9fb
commit befbc5fdb8
2 changed files with 9 additions and 2 deletions
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5
include/fmt/format.h
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@ -738,8 +738,9 @@ using is_double_double = bool_constant<std::numeric_limits<T>::digits == 106>;
#endif
// An allocator that uses malloc/free to allow removing dependency on the C++
// standard libary runtime.
template <typename T> struct allocator {
// standard libary runtime. std::decay is used for back_inserter to be found by
// ADL when applied to memory_buffer.
template <typename T> struct allocator : private std::decay<void> {
using value_type = T;
T* allocate(size_t n) {

6
test/format-test.cc
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@ -481,6 +481,12 @@ TEST(memory_buffer_test, max_size_allocator_overflow) {
EXPECT_THROW(buffer.resize(161), std::exception);
}
TEST(memory_buffer_test, back_insert_iterator) {
fmt::memory_buffer buf;
using iterator = decltype(std::back_inserter(buf));
EXPECT_TRUE(fmt::detail::is_back_insert_iterator<iterator>::value);
}
TEST(format_test, digits2_alignment) {
auto p =
fmt::detail::bit_cast<fmt::detail::uintptr_t>(fmt::detail::digits2(0));