namespace Test {
struct T {};
void F(T t) {}
};
int main() {
Test::T t;
F(t); // Why no `Test::`?
}
Why there is no need of Test:: before F(t)?
What is the rule behind this?
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chaosink
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6[Argument-dependent lookup](https://en.cppreference.com/w/cpp/language/adl) – songyuanyao May 26 '20 at 07:21
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That's exactly what ADL try to achieve. Imagine you are using an operator overload? – LIU Qingyuan May 26 '20 at 07:25