C++ calling a template function from another template function

Question

I just tried the following code

class MailBox{
};

 template<typename T>
     void foo(T){
     cout << "In foo" << endl;
 }

template<typename T>
 void foo1(T){
     foo(T);
 }

 main()
 {
         MailBox m;
         std::vector<MailBox> m1;

         foo1(m1);
 }

We are getting below error while compilation

test1.cpp: In function âvoid foo1(T)â:
test1.cpp:15: error: expected primary-expression before â)â token

Any idea how to resolve this ?

Paul R · Accepted Answer · 2013-03-01 07:49:38Z

7

You're missing formal parameters:

 template<typename T>
     void foo(T t) {
         cout << "In foo" << endl;
 }

 template<typename T>
     void foo1(T t) {
         foo(t);
 }

answered Mar 1, 2013 at 7:49

Paul R

214k38 gold badges402 silver badges579 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Arne Mertz Over a year ago

to be precise, the formal parameter is only needed in foo1. You might even get "unused parameter" warnings if you provide one in foo.

Paul R Over a year ago

@Arne: True - I was aiming for simplicity in the answer and also assuming that the real foo would eventually do something useful with its parameter, but you are correct, of course.

aaaaaa123456789 · Accepted Answer · 2013-03-01 07:50:42Z

1

You're forgetting the names of the parameters!

For instance, foo1() should look like this:

template <typename T>
  foo1 (T myT) {
    foo(myT);
  }

Remember that template'd types are still types, and you need to use them to declare things (like variables) of those types.

answered Mar 1, 2013 at 7:50

aaaaaa123456789

5,9821 gold badge22 silver badges35 bronze badges

Collectives™ on Stack Overflow

C++ calling a template function from another template function

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related