CODEWITHSUNDEEP
c++templates
Avraam Mavridis
Avraam Mavridis

Reputation: 8920

Invalid argument in template template parameter

I am trying this simple template template parameter example:

template <typename T, template <typename> class Cont>
class Stack {
    //...
  private:
    Cont<T> s_;
};



int main(){
    Stack<int,std::vector> aStack1;

}

When I am trying to compile the compiler complains: error type mismatch at argument 2 in template parameter list...

Do I have an error or maybe the problem is in the edition of my compiler? I am using g++ on Windows with Mingw

Upvotes: 1

Views: 672

Answers (1)

IdeaHat
IdeaHat

Reputation: 7881

This is becuase, despite having default arguments, std::vector has 2 template arguments (template < class T, class Alloc = allocator<T> >). The following code works just fine:

#include <vector>

template <typename T, template <typename> class Cont>
class Stack {
    //...
  private:
    Cont<T> s_;
};

template <typename T>
using my_vector = std::vector<T>;


int main(){
    Stack<int,my_vector> aStack1;

}

Upvotes: 5

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