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c++gccoverload-resolutiongcc11

Templated operator=() and overload resolution

Consider the following code snippet:

#include <utility>

struct test {
    template <class Other>
    test& operator=(Other&&);

    int& i_;
};


int main() {
    int i = 0;
    test t1{i}, t2{i};
    t1 = std::move(t2); // tries to select the implicitly-declared one!
}

When trying to compile with GCC11.1 (with -std=c++2a), it attempts to select the compiler-generated operator=, which is deleted, and fails. The previous GCC versions successfully build this code.

To my understanding, the implicitly-generated deleted operator= is not viable, so the operator template should be selected. Is it a GCC bug or am I missing something?

Solution

  • It seems like a bug. It looks for templated method on GCC 11.2 but as you mentioned, it sees deleted method on GCC 11.1.