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[global.functions]
# 16 Library introduction [[library]](./#library)
## 16.4 Library-wide requirements [[requirements]](requirements#global.functions)
### 16.4.6 Conforming implementations [[conforming]](conforming#global.functions)
#### 16.4.6.4 Non-member functions [global.functions]
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L3645)
It is unspecified whether any
non-member
functions in the C++ standard library are defined as[inline](dcl.inline "9.2.8 The inline specifier [dcl.inline]")[.](#1.sentence-1)
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L3651)
A call to a non-member function signature
described in [[support]](support "17 Language support library") through [[exec]](exec "33 Execution control library") and[[depr]](depr "Annex D (normative) Compatibility features") shall behave as if the implementation declared no additional
non-member function signatures[.](#2.sentence-1)[155](#footnote-155 "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.")
[3](#3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L3663)
An implementation shall not declare a non-member function signature
with additional default arguments[.](#3.sentence-1)
[4](#4)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L3667)
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]](basic.lookup.argdep "6.5.4 Argument-dependent name lookup"))[.](#4.sentence-1)
[*Note [1](#note-1)*:
The phrase “unless otherwise specified” applies to cases such as
the swappable with requirements ([[swappable.requirements]](swappable.requirements "16.4.4.3 Swappable requirements"))[.](#4.sentence-2)
The exception for overloaded operators allows argument-dependent lookup
in cases like that of[ostream_iterator​::​operator=](ostream.iterator.ops#lib:ostream_iterator,operator= "24.6.3.3 Operations [ostream.iterator.ops]"):
*Effects*: **out_stream* << value;if (*delim* != 0)**out_stream* << *delim*;return *this;
— *end note*]
[155)](#footnote-155)[155)](#footnoteref-155)
A valid C++ program always
calls the expected library non-member function[.](#footnote-155.sentence-1)
An implementation can
also define additional non-member functions that would otherwise not
be called by a valid C++ program[.](#footnote-155.sentence-2)