std::feholdexcept

 

C++

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Language support library

Concepts library (C++20)

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Technical Specifications

 

Numerics library

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Floating-point environment (C++11)

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Compile-time rational arithmetic (C++11)

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gcd (C++17)

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midpoint (C++20)

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bit_cast (C++20)

ispow2 (C++20)

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floor2 (C++20)

log2p1 (C++20)

 

Floating-point environment

Functions

feclearexcept (C++11)

fetestexcept (C++11)

feraiseexcept (C++11)

fegetexceptflagfesetexceptflag (C++11)(C++11)

fegetroundfesetround (C++11)(C++11)

fegetenvfesetenv (C++11)

feholdexcept (C++11)

feupdateenv (C++11)

Macro constants

FE_ALL_EXCEPTFE_DIVBYZEROFE_INEXACTFE_INVALIDFE_OVERFLOWFE_UNDERFLOW (C++11)

FE_DOWNWARDFE_TONEARESTFE_TOWARDZEROFE_UPWARD (C++11)

FE_DFL_ENV (C++11)

 

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

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.

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.

Parameters

envp

-

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

Return value

​0​ on success, non-zero otherwise.

See also

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)