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std::fegetenv

STD：：fegetenv，std：：fesetenv

Defined in header ​​
int fegetenv( std::fenv_t* envp )(1)(since C++11)
int fesetenv( const std::fenv_t* envp (2)(since C++11)

管理浮点环境的状态。

1%29尝试将浮点环境的状态存储在envp...

2%29尝试从envp.该对象的值必须通过调用std::feholdexcept或std::fegetenv或者是一个浮点宏常量。中是否设置了任何浮点状态标志。envp，它们将设置在环境%28中，然后使用std::fetestexcept%29，但不引发相应的浮点异常%28执行继续不间断地执行%29。

参数

envp-pointer to the object of type std::fenv_t which holds the status of the floating-point environment

返回值

​0​在成功的时候，不是零，否则。

另见

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)
FE_DFL_ENV (C++11)default floating-point environment (macro constant)

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在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。

http：//en.cppreference.com/w/cpp/数值/fen/feenv

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