C in a Nutshell

Name

feupdateenv

Synopsis

Sets the floating-point environment to a previously saved state, but preserves exceptions

#include <fenv.h>
voidfeupdateenv( const fenv_t *envp );

The feupdateenv() function internally saves the current floating-point exception status flags before installing the floating-point environment stored in the object referenced by its pointer argument. Then the function raises floating-point exceptions that were set in the saved status flags.

The argument must be a pointer to an object obtained by a prior call to fegetenv() or feholdexcept(), or a macro such as FE_DFL_ENV, which is defined as a pointer to an object of type fenv_t representing the default floating-point environment.

The function returns 0 if successful; a nonzero return value indicates that an error occurred.

Example

See the example for feholdexcept() in this chapter.

See Also

fegetexceptflag(), feraisexcept(), feclearexcept(), fetestexcept(), fegetenv(), feholdexcept(), fesetenv(), feupdateenv()