Full name of submitter (unless configured in github; will be published with the issue): Jim X
[class.default.ctor] p1 says:
If there is no user-declared constructor for class X, a non-explicit constructor having no parameters is implicitly declared as defaulted ([dcl.fct.def]).
Consider this example:
struct X{
template<class U> X(U){} // #2
};
int main(){
X x; // #1
}
#1 is ill-formed since no matching function for call to 'X::X()'. [class.default.ctor] p1 should cover this example, however, #2 is a user-declared constructor template, and the implicitly instantiated declaration is not user-declared anyway.
If there is no user-declared constructor or constructor template for class X, a non-explicit constructor having no parameters is implicitly declared as defaulted ([dcl.fct.def]).
t3nsor and frederick-vs-ja
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