Call Base Default constructor Template Class [duplicate] - c++

Question

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Why can templates only be implemented in the header file?
(17 answers)
Closed 8 years ago.
The question is how to call the base constructor from an inherited template class. I want to create a FixedQueue and overload some function in std::queue. Therefore std:queue is the base class. The keyword using, since c++11, can be used to call the base and it works if this is a specialised class, but I cannot get it working with a template class.
Furthermore I tried it to use the old c++ standard in which I simply invoke the defined constructors in std::queue. However it doesn't work.
h file
#ifndef _HEADER_FIXED_QUEUE_
#define _HEADER_FIXED_QUEUE_
#include <queue>
#include <iostream>
template<class T>
class FixedQueue : public std::queue<T>
{
//using queue<T>::queue<T>;
public:
FixedQueue();
FixedQueue(const T &initial_var);
void foo() { std::cout << "inside\n"; }
};
#endif
cpp file
#include "FixedQueue.h"
template<typename T>
FixedQueue<T>::FixedQueue()
:
std::queue<T>()
{
std::cout << "Default Constructor FixedQueue\n";
}
template<typename T>
FixedQueue<T>::FixedQueue(const T &initial_var)
:
std::queue<T>(initial_var)
{
std::cout << "Specialized Constructor FixedQueue\n";
}
main file.
#include <iostream>
#include "FixedQueue.h"
int main()
{
FixedQueue<int> d_frameSlices;
std::cout << "I want to do something with my queue\n";
}
The question is thus. How do I chain the constructors to the defined constructors in the base class std::queue. The template thing is killing me.
This is the error message I obtain from clang, which is the usual undefined reference.
Undefined symbols for architecture x86_64:
"FixedQueue<int>::FixedQueue()", referenced from:
_main in main-lqoFSA.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
If someone knows how to do this with "using" or the old fashion way I am happy with both. Thanks in advance

Answer 1

you should not put the template in cpp file put it all in header file