[committed,2/3] libstdc++: Define std::stof fallback in terms of std::stod [PR110653]
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Commit Message
Tested x86_64-linux. Pushed to trunk.
-- >8 --
For targets without std::strtof we can define std::stof by calling
std::stod and then checking if the result is out of range of float.
libstdc++-v3/ChangeLog:
PR libstdc++/110653
* include/bits/basic_string.h [!_GLIBCXX_HAVE_STRTOF] (stof):
Define in terms of std::stod.
---
libstdc++-v3/include/bits/basic_string.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
@@ -4153,6 +4153,22 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
inline float
stof(const string& __str, size_t* __idx = 0)
{ return __gnu_cxx::__stoa(&std::strtof, "stof", __str.c_str(), __idx); }
+#else
+ inline float
+ stof(const string& __str, size_t* __idx = 0)
+ {
+ double __d = std::stod(__str, __idx);
+ if (__builtin_isfinite(__d))
+ {
+ double __abs_d = __builtin_fabs(__d);
+ if (__abs_d < __FLT_MIN__ || __abs_d > __FLT_MAX__)
+ {
+ errno = ERANGE;
+ std::__throw_out_of_range("stof");
+ }
+ }
+ return __d;
+ }
#endif
#if _GLIBCXX_USE_C99_STDLIB || _GLIBCXX_HAVE_STRTOLD