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Showing content from https://timsong-cpp.github.io/cppwp/n4659/namespace.constraints below:

[namespace.constraints]

20 Library introduction [library] 20.5 Library-wide requirements [requirements] 20.5.4 Constraints on programs [constraints] 20.5.4.2 Namespace use [namespace.constraints] 20.5.4.2.1 Namespace std [namespace.std]

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

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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