cfenv
这个标头最初在C标准库中作为<fenv.h>...
此标头是浮点环境图书馆。
类型
fenv_t | The type representing the entire floating-point environment |
|---|---|
fexcept_t | The type representing all floating-point status flags collectively |
功能
feclearexcept (C++11) | clears the specified floating-point status flags (function) |
|---|---|
fetestexcept (C++11) | determines which of the specified floating-point status flags are set (function) |
feraiseexcept (C++11) | raises the specified floating-point exceptions (function) |
fegetexceptflagfesetexceptflag (C++11)(C++11) | copies the state of the specified floating-point status flags from or to the floating-point environment (function) |
fegetroundfesetround (C++11)(C++11) | gets or sets rounding direction (function) |
fegetenvfesetenv (C++11) | saves or restores the current floating point environment (function) |
feholdexcept (C++11) | saves the environment, clears all status flags and ignores all future errors (function) |
feupdateenv (C++11) | restores the floating-point environment and raises the previously raise exceptions (function) |
宏
FE_ALL_EXCEPTFE_DIVBYZEROFE_INEXACTFE_INVALIDFE_OVERFLOWFE_UNDERFLOW (C++11) | floating-point exceptions (macro constant) |
|---|---|
FE_DOWNWARDFE_TONEARESTFE_TOWARDZEROFE_UPWARD (C++11) | floating-point rounding direction (macro constant) |
FE_DFL_ENV (C++11) | default floating-point environment (macro constant) |
简介
二次
namespace std {
// types
typedef /*object type*/ fenv_t;
typedef /*integer type*/ fexcept_t;
// 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);
}二次
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