main.cpp

#include "mystruct.h"
#include <iostream>
#include <string>

using mystruct::MyStruct;
using std::string;

int main() {
  const string name("hoge");
  constexpr unsigned char age = 8;
  MyStruct m(name, age);
  std::cout << "Hello, " << m << std::endl;
}

Makefile

.PHONY: all clean
all: a.out
	./a.out

clean:
	rm a.out

a.out: main.cpp mystruct.h mystruct.cpp
	@echo "Compiling..."
	$(CXX) -std=c++14 main.cpp mystruct.cpp -o a.out \
		-Wall -Wextra

mystruct.cpp

#include "mystruct.h"

namespace mystruct {
using std::ostream;
using std::string;

MyStruct::MyStruct(const string &name, const unsigned char age)
    : name(name), age(age){};

ostream &operator<<(ostream &os, const MyStruct &m) {
  os << "(" << m.name << ", " << static_cast<unsigned int>(m.age) << ")";
  return os;
}

} // namespace mystruct

mystruct.h

#ifndef _MYSTRUCT_H_
#define _MYSTRUCT_H_
#include <iostream>
#include <string>

namespace mystruct {

class MyStruct {
public:
  MyStruct() = delete;
  MyStruct(const std::string &, const unsigned char);

  friend std::ostream &operator<<(std::ostream &, const MyStruct &);

private:
  const std::string name;
  const unsigned char age;
};
} // namespace mystruct

#endif