std::fegetexceptflag, std::fesetexceptflag

 

哋它亢++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (哋它亢++20)

Language support library

Concepts library (哋它亢++20)

Metaprogramming library (哋它亢++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (哋它亢++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (哋它亢++17)

Regular expressions library (哋它亢++11)

Concurrency support library (哋它亢++11)

Technical specifications

Symbols index

External libraries

 

Numerics library

Common mathematical functions
Mathematical special functions (哋它亢++17)
Mathematical constants (哋它亢++20)
Basic linear algebra algorithms (哋它亢++26)
Floating-point environment (哋它亢++11)
Complex numbers
Numeric arrays
Pseudo-random number generation
Factor operations
gcd (哋它亢++17)
lcm (哋它亢++17)
Interpolations
midpoint (哋它亢++20)
lerp (哋它亢++20)
Saturation arithmetic
add_sat (哋它亢++26) sub_sat (哋它亢++26) saturate_cast (哋它亢++26)	mul_sat (哋它亢++26) div_sat (哋它亢++26)
Generic numeric operations
iota (哋它亢++11) ranges::iota (哋它亢++23) accumulate inner_product adjacent_difference partial_sum	reduce (哋它亢++17) transform_reduce (哋它亢++17) inclusive_scan (哋它亢++17) exclusive_scan (哋它亢++17) transform_inclusive_scan (哋它亢++17) transform_exclusive_scan (哋它亢++17)
Bit operations
has_single_bit (哋它亢++20)     bit_cast (哋它亢++20) bit_ceil (哋它亢++20) bit_floor (哋它亢++20) bit_width (哋它亢++20) rotl (哋它亢++20) rotr (哋它亢++20)	popcount (哋它亢++20) countl_zero (哋它亢++20) countl_one (哋它亢++20) countr_zero (哋它亢++20) countr_one (哋它亢++20) byteswap (哋它亢++23) endian (哋它亢++20)

 

Floating-point environment

Functions

feclearexcept (哋它亢++11)

fetestexcept (哋它亢++11)

feraiseexcept (哋它亢++11)

fegetexceptflagfesetexceptflag (哋它亢++11)(哋它亢++11)

fegetroundfesetround (哋它亢++11)(哋它亢++11)

fegetenvfesetenv (哋它亢++11)(哋它亢++11)

feholdexcept (哋它亢++11)

feupdateenv (哋它亢++11)

Macro constants

FE_ALL_EXCEPTFE_DIVBYZEROFE_INEXACTFE_INVALIDFE_OVERFLOWFE_UNDERFLOW (哋它亢++11)(哋它亢++11)(哋它亢++11)(哋它亢++11)(哋它亢++11)(哋它亢++11)

FE_DOWNWARDFE_TONEARESTFE_TOWARDZEROFE_UPWARD (哋它亢++11)(哋它亢++11)(哋它亢++11)(哋它亢++11)

FE_DFL_ENV (哋它亢++11)

 

Defined in header <cfenv>
int fegetexceptflag( std::fexcept_t* flagp, int excepts );	(1)	(since 哋它亢++11)
int fesetexceptflag( const std::fexcept_t* flagp, int excepts );	(2)	(since 哋它亢++11)

1) Attempts to obtain the full contents of the floating-point exception flags that are listed in the bitmask argument excepts, which is a bitwise OR of the floating point exception macros.

2) Attempts to copy the full contents of the floating-point exception flags that are listed in excepts from flagp into the floating-point environment. Does not raise any exceptions, only modifies the flags.

The full contents of a floating-point exception flag is not necessarily a boolean value indicating whether the exception is raised or cleared. For example, it may be a struct which includes the boolean status and the address of the code that triggered the exception. These functions obtain all such content and obtain/store it in flagp in implementation-defined format.

Parameters

flagp	-	pointer to an std::fexcept_t object where the flags will be stored or read from
excepts	-	bitmask listing the exception flags to get/set

Return value

​0​ on success, non-zero otherwise.