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Fix dangling reference

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Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>
This commit is contained in:
Vladislav Shchapov 2023-05-05 12:49:59 +05:00
parent d8973bf16b
commit ee4a4611b1
1 changed files with 5 additions and 6 deletions
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11
include/fmt/core.h
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@ -1671,27 +1671,26 @@ constexpr auto encode_types() -> unsigned long long {
template <typename Context, typename T> template <typename Context, typename T>
FMT_CONSTEXPR FMT_INLINE auto make_value(T&& val) -> value<Context> { FMT_CONSTEXPR FMT_INLINE auto make_value(T&& val) -> value<Context> {
const auto& arg = arg_mapper<Context>().map(FMT_FORWARD(val)); using arg_type = decltype(arg_mapper<Context>().map(FMT_FORWARD(val)));
constexpr bool formattable_char = constexpr bool formattable_char =
!std::is_same<decltype(arg), const unformattable_char&>::value; !std::is_same<arg_type, unformattable_char>::value;
static_assert(formattable_char, "Mixing character types is disallowed."); static_assert(formattable_char, "Mixing character types is disallowed.");
// Formatting of arbitrary pointers is disallowed. If you want to format a // Formatting of arbitrary pointers is disallowed. If you want to format a
// pointer cast it to `void*` or `const void*`. In particular, this forbids // pointer cast it to `void*` or `const void*`. In particular, this forbids
// formatting of `[const] volatile char*` printed as bool by iostreams. // formatting of `[const] volatile char*` printed as bool by iostreams.
constexpr bool formattable_pointer = constexpr bool formattable_pointer =
!std::is_same<decltype(arg), const unformattable_pointer&>::value; !std::is_same<arg_type, unformattable_pointer>::value;
static_assert(formattable_pointer, static_assert(formattable_pointer,
"Formatting of non-void pointers is disallowed."); "Formatting of non-void pointers is disallowed.");
constexpr bool formattable = constexpr bool formattable = !std::is_same<arg_type, unformattable>::value;
!std::is_same<decltype(arg), const unformattable&>::value;
static_assert( static_assert(
formattable, formattable,
"Cannot format an argument. To make type T formattable provide a " "Cannot format an argument. To make type T formattable provide a "
"formatter<T> specialization: https://fmt.dev/latest/api.html#udt"); "formatter<T> specialization: https://fmt.dev/latest/api.html#udt");
return {arg}; return {arg_mapper<Context>().map(FMT_FORWARD(val))};
} }
template <typename Context, typename T> template <typename Context, typename T>