CODEWITHSUNDEEP
c++c++11
cogle
cogle

Reputation: 1079

Incorrect number of template arguments with decltype.

In the below program when compiling it complains that there should be 2 template arguments but there is only 1.

template<typename T, typename U = T, 
    typename = std::enable_if<std::is_convertible<std::decltype(int()), int>::value>::type>
void func(T t, U u){}

However the below code compiles,

template<typename T, typename U = T, 
    typename = std::enable_if<std::is_convertible<int, int>::value>::type>
void func(T t, U u){}

I am wondering what the difference between the two is and how I might make this code compile.

Upvotes: 0

Views: 65

Answers (1)

Lightness Races in Orbit
Lightness Races in Orbit

Reputation: 385098

decltype is a keyword, not a function; you're confusing your parser. Drop the std::.

(live demo)

Upvotes: 3

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