I have to use C++ for a project (normally doing Haskell and C) and I completely hang on headers for namespaces. When I leave away the "arrays.hpp" and directly include "arrays.cpp" into other files (which is bad practice, I know). The code works fine, but when I try to define the header for the following code it no longer works (of course, I still pass all the .cpps to g++). I already read several Stack Overflow posts on that topic, but none of the proposed solutions worked for me, so I would really appreciate it if you could tell me how the header for this code might look.
#include <vector>
#include <stdlib.h>
#include "arrays.hpp"
namespace Arrays {
template<typename Field> class Array {
private:
int rank;
int* shape;
Field* data;
public:
Array(int _rank, int* _shape, Field* _data) {
rank = _rank;
shape = _shape;
data = _data;
}
Array(std::vector<Field> vector) {
rank = 1;
shape = (int*)malloc(sizeof(int));
shape[0] = (int)vector.size();
data = (Field*)malloc(sizeof(Field)*vector.size());
for(int i = 0; i < vector.size(); i++)
data[i] = vector[i];
}
};
}
Here is what I tried so far:
#ifndef ARRAYS_HPP
#define ARRAYS_HPP
namespace Arrays {
template<typename Field> class Array;
}
#endif
And this is G++'s response after invoking it with g++ *.cpp):
error: variable ‘Arrays::Array<int> array’ has initializer but incomplete type
