Calling a static template method from a template function

Question

I'm trying to do a template method that calls a template static method of another class, but I get some compiling errors. The minimal case is the following.

If I compile the code below

template<class E, class D>
int foo() {
  return D::bar<E>() + 1;
}

it throws the following output

g++ -std=c++11 test.cpp -c
test.cpp: In function ‘int foo()’:
test.cpp:4:18: error: expected primary-expression before ‘>’ token
   return D::bar<E>() + 1;
                  ^
test.cpp:4:20: error: expected primary-expression before ‘)’ token
   return D::bar<E>() + 1;

When I replace D::bar<E> with D::bar, the compilation pass so It seems there is some parsing problem with the template argument of the function. Like other cases I think it needs some using or typename hack to make it work.

Community · Accepted Answer · 2017-05-23 12:32:06Z

7

You need to specify that the dependent name bar is a template:

return D::template bar<E>() + 1;
//        ^^^^^^^^

Live Demo

See this question for more information about the typename and template keywords.

edited May 23, 2017 at 12:32

CommunityBot

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answered Nov 9, 2015 at 12:59

TartanLlama

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