Friend classes or functions can be declared within a class template. When a template is instantiated, the names of its friends are treated as if the specialization had been explicitly declared at its point of instantiation.
As with non-template classes, the names of namespace-scope friend functions of a class template specialization are not visible during an ordinary lookup unless explicitly declared at namespace scope ([class.friend]). Such names may be found under the rules for associated classes ([basic.lookup.argdep]).140 [ Example:
template<typename T> struct number {
number(int);
friend number gcd(number x, number y) { return 0; };
};
void g() {
number<double> a(3), b(4);
a = gcd(a,b); b = gcd(3,4); }
— end example ]
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4