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## C headers <a id="depr.c.headers">[[depr.c.headers]]</a>
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For compatibility with the C standard library, the C++ standard library
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provides the *C headers* shown in [[depr.c.headers]].
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### Header `<complex.h>` synopsis <a id="depr.complex.h.syn">[[depr.complex.h.syn]]</a>
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``` cpp
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#include <complex>
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```
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The header `<complex.h>` behaves as if it simply includes the header
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`<complex>`.
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[*Note 1*: Names introduced by `<complex>` in namespace `std` are not
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placed into the global namespace scope by `<complex.h>`. — *end note*]
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### Header `<iso646.h>` synopsis <a id="depr.iso646.h.syn">[[depr.iso646.h.syn]]</a>
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The C++ header `<iso646.h>` is empty.
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[*Note 1*: `and`, `and_eq`, `bitand`, `bitor`, `compl`, `not_eq`,
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`not`, `or`, `or_eq`, `xor`, and `xor_eq` are keywords in this
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International Standard [[lex.key]]. — *end note*]
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### Header `<stdalign.h>` synopsis <a id="depr.stdalign.h.syn">[[depr.stdalign.h.syn]]</a>
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``` cpp
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#define __alignas_is_defined 1
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```
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The contents of the C++ header `<stdalign.h>` are the same as the C
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standard library header `<stdalign.h>`, with the following changes: The
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header `<stdalign.h>` does not define a macro named `alignas`.
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See also: ISO C 7.15
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### Header `<stdbool.h>` synopsis <a id="depr.stdbool.h.syn">[[depr.stdbool.h.syn]]</a>
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``` cpp
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#define __bool_true_false_are_defined 1
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```
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The contents of the C++ header `<stdbool.h>` are the same as the C
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standard library header `<stdbool.h>`, with the following changes: The
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header `<stdbool.h>` does not define macros named `bool`, `true`, or
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`false`.
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See also: ISO C 7.18
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### Header `<tgmath.h>` synopsis <a id="depr.tgmath.h.syn">[[depr.tgmath.h.syn]]</a>
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``` cpp
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#include <cmath>
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#include <complex>
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```
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The header `<tgmath.h>` behaves as if it simply includes the headers
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`<cmath>` and `<complex>`.
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[*Note 1*: The overloads provided in C by type-generic macros are
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already provided in `<complex>` and `<cmath>` by “sufficient” additional
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overloads. — *end note*]
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[*Note 2*: Names introduced by `<cmath>` or `<complex>` in namespace
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`std` are not placed into the global namespace scope by
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`<tgmath.h>`. — *end note*]
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### Other C headers <a id="depr.c.headers.other">[[depr.c.headers.other]]</a>
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Every C header other than , , , , and , each of which has a name of the
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form `<name.h>`, behaves as if each name placed in the standard library
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namespace by the corresponding `<cname>` header is placed within the
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global namespace scope, except for the functions described in
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[[sf.cmath]], the declaration of `std::byte` [[cstddef.syn]], and the
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functions and function templates described in [[support.types.byteops]].
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It is unspecified whether these names are first declared or defined
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within namespace scope [[basic.scope.namespace]] of the namespace `std`
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and are then injected into the global namespace scope by explicit
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*using-declaration*s [[namespace.udecl]].
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[*Example 1*: The header `<cstdlib>` assuredly provides its
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declarations and definitions within the namespace `std`. It may also
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provide these names within the global namespace. The header `<stdlib.h>`
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assuredly provides the same declarations and definitions within the
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global namespace, much as in the C Standard. It may also provide these
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names within the namespace `std`. — *end example*]
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