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[temp.fct.general]
13 Templates [temp]
13.7 Template declarations [temp.decls]
13.7.7 Function templates [temp.fct]
13.7.7.1 General [temp.fct.general]
A function template defines an unbounded set of related functions.
[Example 1:
A family of sort functions can be declared like this:template class Array { };template void sort(Array&);
â end example]
[Note 1:
A function template can have the same name as other function templates and non-template functions ([dcl.fct]) in the same scope.
â end note]
A non-template function is not related to a function template (i.e., it is never considered to be a specialization), even if it has the same name and type as a potentially generated function template specialization.115
That is, declarations of non-template functions do not merely guide overload resolution of function template specializations with the same name.
If such a non-template function is odr-used ([basic.def.odr]) in a program, it must be defined; it will not be implicitly instantiated using the function template definition.