Standard library header <cfenv> (C++11)
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<cfenv> (C++11)
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<atomic> (C++11)
<barrier> (C++20)
<condition_variable> (C++11)
<future> (C++11)
<hazard_pointer> (C++26)
<latch> (C++20)
<mutex> (C++11)
<rcu> (C++26)
<semaphore> (C++20)
<shared_mutex> (C++14)
<stdatomic.h> (C++23)
<stop_token> (C++20)
<thread> (C++11)
<execution> (C++17)
This header was originally in the C standard library as <fenv.h>.
This header is part of the floating-point environment library.
Contents
[edit] Types
fexcept_t
(C++11)
(typedef) [edit]
[edit] Functions
(C++11)(C++11)
(function) [edit]
(C++11)
(function) [edit]
(C++11)
(function) [edit]
[edit] Macros
[edit] Synopsis
#define FE_ALL_EXCEPT /* see description */ #define FE_DIVBYZERO /* see description */ // optional #define FE_INEXACT /* see description */ // optional #define FE_INVALID /* see description */ // optional #define FE_OVERFLOW /* see description */ // optional #define FE_UNDERFLOW /* see description */ // optional #define FE_DOWNWARD /* see description */ // optional #define FE_TONEAREST /* see description */ // optional #define FE_TOWARDZERO /* see description */ // optional #define FE_UPWARD /* see description */ // optional #define FE_DFL_ENV /* see description */ namespace std { // types using fenv_t = /* object type */; using fexcept_t = /* object type */; // functions int feclearexcept(int except); int fegetexceptflag(fexcept_t* pflag, int except); int feraiseexcept(int except); int fesetexceptflag(const fexcept_t* pflag, int except); int fetestexcept(int except); int fegetround(void); int fesetround(int mode); int fegetenv(fenv_t* penv); int feholdexcept(fenv_t* penv); int fesetenv(const fenv_t* penv); int feupdateenv(const fenv_t* penv); }
[edit] Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR | Applied to | Behavior as published | Correct behavior |
---|---|---|---|
LWG 3905 | C++11 | std::fexcept_t must be an integer type
|
it is an object type |