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QmlDesigner: proper std::to_chars float fallback

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On older toolchains (e.g., RHEL 8, macOS < 13.3), std::to_chars
for floating-point types is may be partially implemented.

Task-number: QDS-14932
Change-Id: I63b17d640efa240e223f506333538a54b121de2c
Reviewed-by: Marco Bubke <marco.bubke@qt.io>
This commit is contained in:
Tim Jenßen
2025-03-14 12:32:39 +01:00
committed by Tim Jenssen
parent d829f57706
commit 3f0f5e0ae4
1 changed files with 14 additions and 7 deletions
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21
src/libs/nanotrace/staticstring.h
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@@ -5,14 +5,17 @@
#include <utils/smallstringview.h>
#if !(defined(__cpp_lib_to_chars) && (__cpp_lib_to_chars >= 201611L))
# include <QLocale>
#endif
#include <array>
#include <charconv>
#include <limits>
#if !defined(__cpp_lib_to_chars) || (__cpp_lib_to_chars < 201611L) || \
(defined(__GNUC__) && __GNUC__ < 11) || \
(defined(_MSC_VER) && _MSC_VER < 1930) || \
(defined(__clang_major__) && __clang_major__ < 14)
#define NO_STD_FLOAT_TO_CHARS 1
#endif
namespace NanotraceHR {
template<std::size_t Capacity>
@@ -58,10 +61,14 @@ public:
template<typename Type, typename std::enable_if_t<std::is_arithmetic_v<Type>, bool> = true>
void append(Type number)
{
#if !(defined(__cpp_lib_to_chars) && (__cpp_lib_to_chars >= 201611L))
#if NO_STD_FLOAT_TO_CHARS
// Fallback using snprintf with sufficient precision.
if constexpr (std::is_floating_point_v<Type>) {
QLocale locale{QLocale::Language::C};
append(locale.toString(number).toStdString());
char buffer[std::numeric_limits<Type>::max_digits10 + 2];
auto size = std::snprintf(buffer, sizeof(buffer), "%.9f", number);
if (size >= 0)
append({buffer, size});
return;
}
#endif