2.8 KiB
[global.functions]
16 Library introduction [library]
16.4 Library-wide requirements [requirements]
16.4.6 Conforming implementations [conforming]
16.4.6.4 Non-member functions [global.functions]
It is unspecified whether any non-member functions in the C++ standard library are defined asinline.
A call to a non-member function signature described in [support] through [exec] and[depr] shall behave as if the implementation declared no additional non-member function signatures.155
An implementation shall not declare a non-member function signature with additional default arguments.
Unless otherwise specified, calls made by functions in the standard library to non-operator, non-member functions do not use functions from another namespace which are found through argument-dependent name lookup ([basic.lookup.argdep]).
[Note 1:
The phrase âunless otherwise specifiedâ applies to cases such as the swappable with requirements ([swappable.requirements]).
The exception for overloaded operators allows argument-dependent lookup in cases like that ofostream_iterator::operator=:
Effects: *out_stream << value;if (delim != 0)*out_stream << delim;return *this;
â end note]
A valid C++ program always calls the expected library non-member function.
An implementation can also define additional non-member functions that would otherwise not be called by a valid C++ program.