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The macro constant FE_DFL_ENV expands to an expression of type const fenv_t*, which points to a full copy of the default floating-point environment, that is, the environment as loaded at program startup.
Additional macros that begin with
FE_ followed by uppercase letters, and have the type const fenv_t*, may be supported by an implementation.
|This section is incomplete|
Reason: no example
C++ documentation for FE_DFL_ENV