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std::feholdexcept

STD：：feholdexcept

Defined in header ​​
int feholdexcept( std::fenv_t* envp )​(since C++11)

首先，将当前的浮点环境保存到envp%28类似于std::fegetenv%29，然后清除所有浮点状态标志，然后安装不停止模式：将来的浮点异常不会中断执行%28不会捕获%29，直到浮点环境被std::feupdateenv或std::fesetenv...

此函数可用于子程序的开头，该子程序必须隐藏它可能从调用方引发的浮点异常。如果只有一些异常必须被抑制，而另一些则必须报告，则不停止模式通常以调用std::feupdateenv在清除不需要的异常之后。

参数

envp-pointer to the object of type std::fenv_t where the floating-point environment will be stored

返回值

​0​在成功的时候，不是零，否则。

另见

feupdateenv (C++11)restores the floating-point environment and raises the previously raise exceptions (function)
fegetenvfesetenv (C++11)saves or restores the current floating point environment (function)
FE_DFL_ENV (C++11)default floating-point environment (macro constant)

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

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