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make format_int constexpr (#4032)

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* make format_int constexpr

* format_int can only be constexpr in C++20

* apply clang-format

* drop constexpr for str()
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Dix Lorenz 2024-06-23 15:28:39 +02:00 committed by GitHub
parent edde973126
commit 7ae102bd66
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GPG Key ID: B5690EEEBB952194
1 changed files with 17 additions and 11 deletions
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28
include/fmt/format.h
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@ -3918,12 +3918,14 @@ class format_int {
mutable char buffer_[buffer_size];
char* str_;
template <typename UInt> auto format_unsigned(UInt value) -> char* {
template <typename UInt>
FMT_CONSTEXPR20 auto format_unsigned(UInt value) -> char* {
auto n = static_cast<detail::uint32_or_64_or_128_t<UInt>>(value);
return detail::format_decimal(buffer_, n, buffer_size - 1).begin;
}
template <typename Int> auto format_signed(Int value) -> char* {
template <typename Int>
FMT_CONSTEXPR20 auto format_signed(Int value) -> char* {
auto abs_value = static_cast<detail::uint32_or_64_or_128_t<Int>>(value);
bool negative = value < 0;
if (negative) abs_value = 0 - abs_value;
@ -3933,26 +3935,30 @@ class format_int {
}
public:
explicit format_int(int value) : str_(format_signed(value)) {}
explicit format_int(long value) : str_(format_signed(value)) {}
explicit format_int(long long value) : str_(format_signed(value)) {}
explicit format_int(unsigned value) : str_(format_unsigned(value)) {}
explicit format_int(unsigned long value) : str_(format_unsigned(value)) {}
explicit format_int(unsigned long long value)
explicit FMT_CONSTEXPR20 format_int(int value) : str_(format_signed(value)) {}
explicit FMT_CONSTEXPR20 format_int(long value)
: str_(format_signed(value)) {}
explicit FMT_CONSTEXPR20 format_int(long long value)
: str_(format_signed(value)) {}
explicit FMT_CONSTEXPR20 format_int(unsigned value)
: str_(format_unsigned(value)) {}
explicit FMT_CONSTEXPR20 format_int(unsigned long value)
: str_(format_unsigned(value)) {}
explicit FMT_CONSTEXPR20 format_int(unsigned long long value)
: str_(format_unsigned(value)) {}
/// Returns the number of characters written to the output buffer.
auto size() const -> size_t {
FMT_CONSTEXPR20 auto size() const -> size_t {
return detail::to_unsigned(buffer_ - str_ + buffer_size - 1);
}
/// Returns a pointer to the output buffer content. No terminating null
/// character is appended.
auto data() const -> const char* { return str_; }
FMT_CONSTEXPR20 auto data() const -> const char* { return str_; }
/// Returns a pointer to the output buffer content with terminating null
/// character appended.
auto c_str() const -> const char* {
FMT_CONSTEXPR20 auto c_str() const -> const char* {
buffer_[buffer_size - 1] = '\0';
return str_;
}