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This header declares a set of functions and macros to access the floating-point environment, along with specific types.
The floating-point environment maintains a series of status flags and specific control modes. Specific about the contents of the floating-point environment depend on the implementation, but the status flags generally include the floating-point exceptions and their associated information, and the control modes include at least the rounding direction.
Reference
C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
-
<cfenv> (fenv.h)C++11
- <cfloat> (float.h)
-
<cinttypes> (inttypes.h)C++11
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
-
<cstdbool> (stdbool.h)C++11
- <cstddef> (stddef.h)
-
<cstdint> (stdint.h)C++11
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
-
<ctgmath> (tgmath.h)C++11
- <ctime> (time.h)
-
<cuchar> (uchar.h)C++11
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
-
<array>C++11
- <deque>
-
<forward_list>C++11
- <list>
- <map>
- <queue>
- <set>
- <stack>
-
<unordered_map>C++11
-
<unordered_set>C++11
- <vector>
-
Input/Output:
Multi-threading:
-
<atomic>C++11
-
<condition_variable>C++11
-
<future>C++11
-
<mutex>C++11
-
<thread>C++11
-
Other:
- <algorithm>
- <bitset>
-
<chrono>C++11
-
<codecvt>C++11
- <complex>
- <exception>
- <functional>
-
<initializer_list>C++11
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
-
<random>C++11
-
<ratio>C++11
-
<regex>C++11
- <stdexcept>
- <string>
-
<system_error>C++11
-
<tuple>C++11
-
<type_traits>C++11
-
<typeindex>C++11
- <typeinfo>
- <utility>
- <valarray>
<cfenv> (fenv.h)
functions
-
feclearexceptC++11
-
fegetenvC++11
-
fegetexceptflagC++11
-
fegetroundC++11
-
feholdexceptC++11
-
feraiseexceptC++11
-
fesetenvC++11
-
fesetexceptflagC++11
-
fesetroundC++11
-
fetestexceptC++11
-
feupdateenvC++11
-
types
pragma
-
FENV_ACCESSC++11
-
macro constants
-
FE_ALL_EXCEPTC++11
-
FE_DFL_ENVC++11
-
FE_DIVBYZEROC++11
-
FE_DOWNWARDC++11
-
FE_INEXACTC++11
-
FE_INVALIDC++11
-
FE_OVERFLOWC++11
-
FE_TONEARESTC++11
-
FE_TOWARDZEROC++11
-
FE_UNDERFLOWC++11
-
FE_UPWARDC++11
-
- Reference
- <cfenv>
header
<cfenv> (fenv.h)
Floating-point environment
The floating-point environment maintains a series of status flags and specific control modes. Specific about the contents of the floating-point environment depend on the implementation, but the status flags generally include the floating-point exceptions and their associated information, and the control modes include at least the rounding direction.
Functions
Floating-point exceptions
- feclearexcept
- Clear floating-point exceptions (function)
- feraiseexcept
- Raise floating-point exception (function)
- fegetexceptflag
- Get floating-point exception flags (function)
- fesetexceptflag
- Set floating-point exception flags (function)
Rounding direction
- fegetround
- Get rounding direction mode (function)
- fesetround
- Set rounding direction mode (function)
Entire environment
- fegetenv
- Get floating-point environment (function)
- fesetenv
- Set floating-point environment (function)
- feholdexcept
- Hold floating-point exceptions (function)
- feupdateenv
- Update floating-point environment (function)
Other
- fetestexcept
- Test for floating-point exceptions (function)
Types
- fenv_t
- Floating-point environment type (type)
- fexcept_t
- Floating-point exceptions type (type)
Macro constants
Floating-point exceptions
- FE_DIVBYZERO
- Pole error exception (macro)
- FE_INEXACT
- Inexact result exception (macro)
- FE_INVALID
- Invalid argument exception (macro)
- FE_OVERFLOW
- Overflow range error exception (macro)
- FE_UNDERFLOW
- Underflow range error exception (macro)
- FE_ALL_EXCEPT
- All exceptions (macro)
Rounding directions
- FE_DOWNWARD
- Downward rounding direction mode (macro)
- FE_TONEAREST
- To-nearest rounding direction mode (macro)
- FE_TOWARDZERO
- Toward-zero rounding direction mode (macro)
- FE_UPWARD
- Upward rounding direction mode (macro)
Entire evnironment
- FE_DFL_ENV
- Default environment (macro)
Pragmas
- FENV_ACCESS
- Access to Floating-point environment (pragma)
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Spotted an error? contact us