| Common mathematical functions | |||||||||||||||||||||||||||||||
| Mathematical special functions(C++17) | |||||||||||||||||||||||||||||||
| Mathematical constants(C++20) | |||||||||||||||||||||||||||||||
| Basic linear algebra algorithms(C++26) | |||||||||||||||||||||||||||||||
| Data-parallel types (SIMD)(C++26) | |||||||||||||||||||||||||||||||
| Floating-point environment(C++11) | |||||||||||||||||||||||||||||||
| Complex numbers | |||||||||||||||||||||||||||||||
Numeric array (valarray) | |||||||||||||||||||||||||||||||
| Pseudo-random number generation | |||||||||||||||||||||||||||||||
| Bit manipulation(C++20) | |||||||||||||||||||||||||||||||
| Saturation arithmetic(C++26) | |||||||||||||||||||||||||||||||
| Factor operations | |||||||||||||||||||||||||||||||
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| Interpolations | |||||||||||||||||||||||||||||||
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| Generic numeric operations | |||||||||||||||||||||||||||||||
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| C-style checked integer arithmetic | |||||||||||||||||||||||||||||||
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| Functions | ||||
(C++11) | ||||
(C++11) | ||||
(C++11) | ||||
(C++11)(C++11) | ||||
(C++11)(C++11) | ||||
(C++11)(C++11) | ||||
feholdexcept (C++11) | ||||
(C++11) | ||||
| Macro constants | ||||
(C++11)(C++11)(C++11)(C++11)(C++11)(C++11) | ||||
(C++11)(C++11)(C++11)(C++11) | ||||
(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 byenvp (similar tostd::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 bystd::feupdateenv orstd::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 tostd::feupdateenv after clearing the unwanted exceptions.
| envp | - | pointer to the object of typestd::fenv_t where the floating-point environment will be stored |
0 on success, non-zero otherwise.
(C++11) | restores the floating-point environment and raises the previously raised exceptions (function)[edit] |
(C++11) | saves or restores the current floating-point environment (function)[edit] |
(C++11) | default floating-point environment (macro constant)[edit] |
C documentation forfeholdexcept | |
