I am trying to create a custom 'Matrix' class in C++ and have run into an "Undefined symbols for architecture x86_64:" error that I cannot understand. My relevant code is-
HEADER
#ifndef CORE_H
#define CORE_H
#include <stdint.h>
class Size
{
public:
Size(const uint64_t nrows, const uint64_t ncols, const uint64_t nframes);
uint64_t rows;
uint64_t cols;
uint64_t frames;
};
template <typename T>
class Matrix
{
public:
Matrix(const uint64_t rows, const uint64_t cols, const uint64_t frames);
Matrix(const uint64_t rows, const uint64_t cols, const uint64_t frames, T *data);
void print();
private:
Size sz;
T *_data;
};
#endif //CORE_H
SOURCE
#include <string.h>
#include <cstdlib>
#include <stdio.h>
#include "core.h"
Size::Size(const uint64_t nrows, const uint64_t ncols, const uint64_t nframes)
{
rows = nrows;
cols = ncols;
frames = nframes;
}
template <typename T>
Matrix<T>::Matrix(const uint64_t rows, const uint64_t cols, const uint64_t frames)
{
Matrix<T>(rows, cols, frames, malloc(rows * cols * frames * sizeof(T)));
}
template <typename T>
Matrix<T>::Matrix(const uint64_t rows, const uint64_t cols, const uint64_t frames, T *data)
{
sz = Size(rows, cols, frames);
_data = data;
}
template <typename T>
void Matrix<T>::print()
{
printf("[");
for (uint64_t f = 0; f < sz.frames; f++) {
printf("[");
for (uint64_t r = 0; r < sz.rows; r++) {
for (uint64_t c = 0; c < sz.cols; c++) {
printf("%.3f,", element(r, c, f));
}
printf("\n");
}
printf("]\n");
}
printf("]\n");
}
TEST
#include "core.h"
int main(int argc, char *argv[])
{
int data[] = { 1, 2, 3, 4, 5, 6, 7, 8};
Matrix<int> mat(2, 2, 2, data);
mat.print();
return 0;
}
ERROR
Undefined symbols for architecture x86_64:
"Matrix<int>::print()", referenced from:
_main in rand.cpp.o
"Matrix<int>::Matrix(int, int, int, int*)", referenced from:
_main in rand.cpp.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [examples/rand] Error 1
make[1]: *** [examples/CMakeFiles/rand.dir/all] Error 2
make: *** [all] Error 2
I'm sure it is something small but I can't figure it out. Any help would be really appreciated!
