tmp/tmpkr87fly_/{from.md → to.md}
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### Header `<cfenv>` synopsis <a id="cfenv.syn">[[cfenv.syn]]</a>
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``` cpp
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#define FE_ALL_EXCEPT see below
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#define FE_DIVBYZERO see below
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#define FE_INEXACT see below
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#define FE_INVALID see below
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#define FE_OVERFLOW see below
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#define FE_UNDERFLOW see below
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#define FE_DOWNWARD see below
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#define FE_TONEAREST see below
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#define FE_TOWARDZERO see below
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#define FE_UPWARD see below
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#define FE_DFL_ENV see below
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namespace std {
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// types
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@@ -38,30 +38,31 @@ namespace std {
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```
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The contents and meaning of the header `<cfenv>` are the same as the C
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standard library header `<fenv.h>`.
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[*Note 1*: This
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the
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The floating-point environment has thread storage duration
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[[basic.stc.thread]]
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environment is the state of the floating-point environment of the thread
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that constructs the corresponding `thread` object
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[[thread.thread.class]]
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[*Note 2*: That is, the child thread gets the floating-point state of
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the parent thread at the time of the child’s creation. — *end note*]
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A separate floating-point environment
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ISO C 7.6
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### Header `<cfenv>` synopsis <a id="cfenv.syn">[[cfenv.syn]]</a>
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``` cpp
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#define FE_ALL_EXCEPT see below
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+
#define FE_DIVBYZERO see below // optional
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#define FE_INEXACT see below // optional
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#define FE_INVALID see below // optional
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#define FE_OVERFLOW see below // optional
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#define FE_UNDERFLOW see below // optional
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#define FE_DOWNWARD see below // optional
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#define FE_TONEAREST see below // optional
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#define FE_TOWARDZERO see below // optional
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#define FE_UPWARD see below // optional
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#define FE_DFL_ENV see below
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namespace std {
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// types
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```
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The contents and meaning of the header `<cfenv>` are the same as the C
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standard library header `<fenv.h>`.
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[*Note 1*: This document does not require an implementation to support
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the `FENV_ACCESS` pragma; it is *implementation-defined* [[cpp.pragma]]
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whether the pragma is supported. As a consequence, it is
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*implementation-defined* whether these functions can be used to test
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floating-point status flags, set floating-point control modes, or run
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under non-default mode settings. If the pragma is used to enable control
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over the floating-point environment, this document does not specify the
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effect on floating-point evaluation in constant
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expressions. — *end note*]
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The floating-point environment has thread storage duration
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[[basic.stc.thread]]. The initial state for a thread’s floating-point
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environment is the state of the floating-point environment of the thread
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that constructs the corresponding `thread` object
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[[thread.thread.class]] or `jthread` object [[thread.jthread.class]] at
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the time it constructed the object.
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[*Note 2*: That is, the child thread gets the floating-point state of
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the parent thread at the time of the child’s creation. — *end note*]
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A separate floating-point environment is maintained for each thread.
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Each function accesses the environment corresponding to its calling
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thread.
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See also: ISO C 7.6
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