Question

Recently, in the gcc-trunk sources was implemented the “user defined literals”.
Tell me please, do I understand correctly that I can`t define a “user defined literals” for variadic char template?

template<char... chars>
int operator"" _call() { return sizeof...(chars); }
...
std::cout << "method"_call;

Up.

I don`t understand why this expression is allowed:

template<char... chars>
int operator"" _call() { return sizeof...(chars); }
...
std::cout << 12345566_call;

and this one is disallowed:

template<char... chars>
int operator"" _call() { return sizeof...(chars); }
...
std::cout << method_call;

?

What’s the point?

Up.
this is because of the ambiguity?

Thanks.

Answer 1

method_call is a valid identifier As is for example some_call or my_call. Now imagine how much code would be broken if such identifiers were allowed to be redefined by operator"".