charconv_compat.hpp File Reference

Portable from_chars for floating-point types. More...

#include <charconv>
#include <cstdlib>
#include <cstring>
#include <system_error>
#include <string>
#include <locale.h>

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Namespaces
namespace	openswmm
namespace	openswmm::detail

Macros
#define	OPENSWMM_CHARCONV_FALLBACK   1

Functions
locale_t	openswmm::detail::c_locale () noexcept
	Process-wide "C" locale handle for strtod_l.
std::from_chars_result	openswmm::from_chars_double (const char *first, const char *last, double &value) noexcept
	Locale-independent parse of a double from a character range.

Detailed Description

Portable from_chars for floating-point types.

Apple libc++ does not support std::from_chars for floating-point types. This header provides a drop-in wrapper that uses strtod as a fallback when the standard library lacks the feature.

Every numeric token in every .inp section goes through here, so the fallback is on the hottest path in the whole load sequence — on a 500k-element model with geometry, parsing is ~80% of open(). See plans/MODEL_LOAD_INIT_OPTIMIZATION_PLAN_2026-08-12.md item 2.1.

Macro Definition Documentation

OPENSWMM_CHARCONV_FALLBACK

#define OPENSWMM_CHARCONV_FALLBACK   1