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#include <iostream>
 
struct A { };
 
struct B {
    B(){}
    explicit B(const A& a) {
        std::cout << "constructor" << std::endl;
    }
 
    //B& operator=(const A& a) {
    //  cout << "assignment operator" << endl;
    //  return *this;
    //}
};
 
int main() {
    A a;
    B b;
    b = a;
 
    return 0;
}
 

prog.cpp: In function 'int main()':
prog.cpp:20:7: error: no match for 'operator=' (operand types are 'B' and 'A')
     b = a;
       ^
prog.cpp:5:8: note: candidate: B& B::operator=(const B&)
 struct B {
        ^
prog.cpp:5:8: note:   no known conversion for argument 1 from 'A' to 'const B&'
prog.cpp:5:8: note: candidate: B& B::operator=(B&&)
prog.cpp:5:8: note:   no known conversion for argument 1 from 'A' to 'B&&'

Standard output is empty