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feholdexcept

From cppreference.com
< c‎ | numeric‎ | fenv
Revision as of 16:27, 1 July 2013 by P12bot (Talk | contribs)

Defined in header <<fenv.h>>
int feholdexcept( fenv_t* envp );
(since C99)

First, saves the current floating-point environment to the object pointed to by envp (similar to 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 feupdateenv or 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 feupdateenv after clearing the unwanted exceptions.

Contents

Parameters

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

Return value

0 on success, non-zero otherwise.

Example

See also

restores the floating-point environment and raises the previously raise exceptions
(function) [edit]
saves or restores the current floating point environment
(function) [edit]
default floating-point environment
(macro constant) [edit]
C++ documentation for feholdexcept