/tmp/cc6TBRKe.o: In function `print_info(intMatrix&)':
ex3.cpp:(.text+0x4d): undefined reference to `intMatrix::getRowSize()'
ex3.cpp:(.text+0x81): undefined reference to `intMatrix::getColumnSize()'
/tmp/cc6TBRKe.o: In function `main':
ex3.cpp:(.text+0x131f): undefined reference to `intMatrix::intMatrix(int, int, int)'
ex3.cpp:(.text+0x133d): undefined reference to `intMatrix::~intMatrix()'
ex3.cpp:(.text+0x1476): undefined reference to `intMatrix::intMatrix(int, int, int)'
ex3.cpp:(.text+0x1494): undefined reference to `intMatrix::~intMatrix()'
ex3.cpp:(.text+0x15cd): undefined reference to `intMatrix::intMatrix(int, int, int)'
ex3.cpp:(.text+0x15eb): undefined reference to `intMatrix::~intMatrix()'
ex3.cpp:(.text+0x1724): undefined reference to `intMatrix::intMatrix(int, int, int)'
ex3.cpp:(.text+0x1742): undefined reference to `intMatrix::~intMatrix()'
ex3.cpp:(.text+0x187b): undefined reference to `intMatrix::intMatrix(int, int, int)'
ex3.cpp:(.text+0x1899): undefined reference to `intMatrix::~intMatrix()'
ex3.cpp:(.text+0x19d2): undefined reference to `intMatrix::intMatrix(int, int, int)'
ex3.cpp:(.text+0x1afe): undefined reference to `intMatrix::getElement(int, int)'
ex3.cpp:(.text+0x1c1a): undefined reference to `intMatrix::~intMatrix()'
ex3.cpp:(.text+0x1d53): undefined reference to `intMatrix::intMatrix(int, int, int)'
ex3.cpp:(.text+0x204a): undefined reference to `intMatrix::fillFrom(std::vector<int, std::allocator<int> >&)'
ex3.cpp:(.text+0x208a): undefined reference to `intMatrix::~intMatrix()'
ex3.cpp:(.text+0x21c3): undefined reference to `intMatrix::intMatrix(int, int, int)'
ex3.cpp:(.text+0x2530): undefined reference to `intMatrix::fillFrom(std::vector<int, std::allocator<int> >&)'
ex3.cpp:(.text+0x264d): undefined reference to `intMatrix::getElement(int, int)'
ex3.cpp:(.text+0x2778): undefined reference to `intMatrix::~intMatrix()'
ex3.cpp:(.text+0x28b1): undefined reference to `intMatrix::intMatrix(int, int, int)'
ex3.cpp:(.text+0x2b54): undefined reference to `intMatrix::getElement(int, int)'
ex3.cpp:(.text+0x2d7e): undefined reference to `intMatrix::getElement(int, int)'
ex3.cpp:(.text+0x2fa8): undefined reference to `intMatrix::getElement(int, int)'
ex3.cpp:(.text+0x31d2): undefined reference to `intMatrix::getElement(int, int)'
ex3.cpp:(.text+0x32fd): undefined reference to `intMatrix::~intMatrix()'
ex3.cpp:(.text+0x36da): undefined reference to `intMatrix::intMatrix(int, int, int)'
ex3.cpp:(.text+0x38ac): undefined reference to `intMatrix::fillFrom(std::vector<int, std::allocator<int> >&)'
ex3.cpp:(.text+0x3904): undefined reference to `intMatrix::saveTo(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
ex3.cpp:(.text+0x39ad): undefined reference to `intMatrix::~intMatrix()'
ex3.cpp:(.text+0x3b6d): undefined reference to `intMatrix::intMatrix(int, int, int)'
ex3.cpp:(.text+0x3bc5): undefined reference to `intMatrix::saveTo(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
ex3.cpp:(.text+0x3c50): undefined reference to `intMatrix::~intMatrix()'
ex3.cpp:(.text+0x3eb8): undefined reference to `intMatrix::~intMatrix()'
ex3.cpp:(.text+0x3eda): undefined reference to `intMatrix::~intMatrix()'
ex3.cpp:(.text+0x3efc): undefined reference to `intMatrix::~intMatrix()'
ex3.cpp:(.text+0x3f1e): undefined reference to `intMatrix::~intMatrix()'
/tmp/cc6TBRKe.o:ex3.cpp:(.text+0x3f40): more undefined references to `intMatrix::~intMatrix()' follow
collect2: error: ld returned 1 exit status