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Floating-point environment

The floating-point environment is the set of floating-point status flags and control modes supported by the implementation. It is thread-local, each thread inherits the initial state of its floating-point environment from the parent thread. Floating-point operations modify the floating-point status flags to indicate abnormal results or auxiliary information. The state of floating-point control modes affects the outcomes of some floating-point operations.

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The floating-point environment access and modification is only meaningful when #pragma STDC FENV_ACCESS is set to ON. Otherwise the implementation is free to assume that floating-point control modes are always the default ones and that floating-point status flags are never tested or modified. In practice, few current compilers, such as HP aCC, Oracle Studio, and IBM XL, support the #pragma explicitly, but most compilers allow meaningful access to the floating-point environment anyway.

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Types

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Defined in header <fenv.h>
fenv_t The type representing the entire floating-point environment
fexcept_t The type representing all floating-point status flags collectively

Functions

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(C99)
 clears the specified floating-point status flags
(function)
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(C99)
 determines which of the specified floating-point status flags are set
(function)
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(C99)
 raises the specified floating-point exceptions
(function)
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(C99)(C99)
 copies the state of the specified floating-point status flags from or to the floating-point environment
(function)
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(C99)(C99)
 gets or sets rounding direction
(function)
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(C99)
 saves or restores the current floating-point environment
(function)
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(C99)
 saves the environment, clears all status flags and ignores all future errors
(function)
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(C99)
 restores the floating-point environment and raises the previously raise exceptions
(function)

Macros

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(C99)
 floating-point exceptions
(macro constant)
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(C99)
 floating-point rounding direction
(macro constant)
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(C99)
 default floating-point environment
(macro constant)

References

See also

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C++ documentation for Floating-point environment
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+ © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
+ https://en.cppreference.com/w/c/numeric/fenv +

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