tmp/tmp6nw8gyfj/{from.md → to.md}
RENAMED
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##### Namespace `std` <a id="namespace.std">[[namespace.std]]</a>
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definitions to namespace `std` or to a
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The behavior of a C++ program is undefined if it declares
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- an explicit specialization of any member function of a standard
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library class template, or
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@@ -16,13 +23,42 @@ The behavior of a C++program is undefined if it declares
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standard library class or class template, or
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- an explicit or partial specialization of any member class template of
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a standard library class or class template, or
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- a deduction guide for any standard library class template.
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A program may explicitly instantiate a template defined in the
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library only if the declaration depends on the name of
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type and the instantiation meets the
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the original template.
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A translation unit shall not declare namespace `std` to be an inline
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namespace
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##### Namespace `std` <a id="namespace.std">[[namespace.std]]</a>
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Unless otherwise specified, the behavior of a C++ program is undefined
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if it adds declarations or definitions to namespace `std` or to a
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namespace within namespace `std`.
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Unless explicitly prohibited, a program may add a template
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specialization for any standard library class template to namespace
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`std` provided that (a) the added declaration depends on at least one
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program-defined type and (b) the specialization meets the standard
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library requirements for the original template.[^21]
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The behavior of a C++ program is undefined if it declares an explicit or
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partial specialization of any standard library variable template, except
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where explicitly permitted by the specification of that variable
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template.
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The behavior of a C++ program is undefined if it declares
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- an explicit specialization of any member function of a standard
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library class template, or
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standard library class or class template, or
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- an explicit or partial specialization of any member class template of
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a standard library class or class template, or
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- a deduction guide for any standard library class template.
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A program may explicitly instantiate a class template defined in the
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standard library only if the declaration (a) depends on the name of at
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least one program-defined type and (b) the instantiation meets the
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standard library requirements for the original template.
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Let `F` denote a standard library function [[global.functions]], a
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standard library static member function, or an instantiation of a
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standard library function template. Unless `F` is designated an
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*addressable function*, the behavior of a C++ program is unspecified
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(possibly ill-formed) if it explicitly or implicitly attempts to form a
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pointer to `F`.
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[*Note 1*: Possible means of forming such pointers include application
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of the unary `&` operator [[expr.unary.op]], `addressof`
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[[specialized.addressof]], or a function-to-pointer standard conversion
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[[conv.func]]. — *end note*]
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Moreover, the behavior of a C++ program is unspecified (possibly
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ill-formed) if it attempts to form a reference to `F` or if it attempts
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to form a pointer-to-member designating either a standard library
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non-static member function [[member.functions]] or an instantiation of a
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standard library member function template.
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Other than in namespace `std` or in a namespace within namespace `std`,
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a program may provide an overload for any library function template
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designated as a *customization point*, provided that (a) the overload’s
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declaration depends on at least one user-defined type and (b) the
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overload meets the standard library requirements for the customization
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point. [^22]
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[*Note 2*: This permits a (qualified or unqualified) call to the
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customization point to invoke the most appropriate overload for the
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given arguments. — *end note*]
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A translation unit shall not declare namespace `std` to be an inline
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namespace [[namespace.def]].
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