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adding FASTFLOAT_IF_CONSTEXPR17

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This commit is contained in:
Daniel Lemire 2025-03-09 17:10:55 -04:00
parent 6f0049a2e7
commit b29208f93d
2 changed files with 9 additions and 3 deletions
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6
include/fast_float/ascii_number.h
View File

@ -299,7 +299,7 @@ parse_number_string(UC const *p, UC const *pend,
return report_parse_error<UC>(
p, parse_error::missing_integer_or_dot_after_sign);
}
if (basic_json_fmt) {
FASTFLOAT_IF_CONSTEXPR17(basic_json_fmt) {
if (!is_integer(*p)) { // a sign must be followed by an integer
return report_parse_error<UC>(p,
parse_error::missing_integer_after_sign);
@ -328,7 +328,7 @@ parse_number_string(UC const *p, UC const *pend,
UC const *const end_of_integer_part = p;
int64_t digit_count = int64_t(end_of_integer_part - start_digits);
answer.integer = span<UC const>(start_digits, size_t(digit_count));
if (basic_json_fmt) {
FASTFLOAT_IF_CONSTEXPR17(basic_json_fmt) {
// at least 1 digit in integer part, without leading zeros
if (digit_count == 0) {
return report_parse_error<UC>(p, parse_error::no_digits_in_integer_part);
@ -357,7 +357,7 @@ parse_number_string(UC const *p, UC const *pend,
answer.fraction = span<UC const>(before, size_t(p - before));
digit_count -= exponent;
}
if (basic_json_fmt) {
FASTFLOAT_IF_CONSTEXPR17(basic_json_fmt) {
// at least 1 digit in fractional part
if (has_decimal_point && exponent == 0) {
return report_parse_error<UC>(p,

6
include/fast_float/constexpr_feature_detect.h
View File

@ -27,6 +27,12 @@
#define FASTFLOAT_HAS_IS_CONSTANT_EVALUATED 0
#endif
#if defined(__cpp_if_constexpr) && __cpp_if_constexpr >= 201606L
#define FASTFLOAT_IF_CONSTEXPR17(x) if constexpr (x)
#else
#define FASTFLOAT_IF_CONSTEXPR17(x) if (x)
#endif
// Testing for relevant C++20 constexpr library features
#if FASTFLOAT_HAS_IS_CONSTANT_EVALUATED && FASTFLOAT_HAS_BIT_CAST && \
defined(__cpp_lib_constexpr_algorithms) && \