The behavior of a C++ program is undefined if it adds declarations or definitions to namespace std or to a namespace within namespace std unless otherwise specified. A program may add a template specialization for any standard library template to namespace std only if the declaration depends on a user-defined type and the specialization meets the standard library requirements for the original template and is not explicitly prohibited.176
The behavior of a C++ program is undefined if it declares
an explicit specialization of any member function of a standard library class template, or
an explicit specialization of any member function template of a standard library class or class template, or
an explicit or partial specialization of any member class template of a standard library class or class template, or
a deduction guide for any standard library class template.
A program may explicitly instantiate a template defined in the standard library only if the declaration depends on the name of a user-defined type and the instantiation meets the standard library requirements for the original template.
A translation unit shall not declare namespace std to be an inline namespace ([namespace.def]).
20.5.4.2.2 Namespace posix [namespace.posix]The behavior of a C++ program is undefined if it adds declarations or definitions to namespace posix or to a namespace within namespace posix unless otherwise specified. The namespace posix is reserved for use by ISO/IEC 9945 and other POSIX standards.
20.5.4.2.3 Namespaces for future standardization [namespace.future]Top level namespaces with a name starting with std and followed by a non-empty sequence of digits are reserved for future standardization. The behavior of a C++ program is undefined if it adds declarations or definitions to such a namespace. [ Example: The top level namespace std2 is reserved for use by future revisions of this International Standard. — end example ]
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