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std::feholdexcept

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int feholdexcept( std::fenv_t* envp )
 ( C++11)
-, , envp ( std::fegetenv), , -: ( ), std::feupdateenv std::fesetenv.
:
First, saves the current floating-point environment to the object pointed to by envp (similar to std::fegetenv), then clears all floating-point status flags, and then installs the non-stop mode: future floating-point exceptions will not interrupt execution (will not trap), until the floating-point environment is restored by std::feupdateenv or std::fesetenv.
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, , . , , -, , std::feupdateenv .
:
This function may be used in the beginning of a subroutine that must hide the floating-point exceptions it may raise from the caller. If only some exceptions must be suppressed, while others must be reported, the non-stop mode is usually ended with a call to std::feupdateenv after clearing the unwanted exceptions.
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envp
std::fenv_t,
:
pointer to the object of type std::fenv_t where the floating-point environment will be stored
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0 on success, non-zero otherwise.
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