strong_type_example.cpp

#include <format>
#include <gw/inplace_string.hpp>
#include <gw/strong_type.hpp>
#include <iostream>
#include <stdexcept>
#include <type_traits>
 
static constexpr auto k_string_size = 20U;
using name_t = gw::strong_type<gw::inplace_string<k_string_size>, struct name_tag>;
using address_t = gw::strong_type<gw::inplace_string<k_string_size>, struct address_tag>;
 
// gw::strong_types are distinct types
static_assert(!std::is_same_v<name_t, address_t>);
 
void print_name(const name_t& name) { std::cout << std::format("{}\n", name); }
 
void print_address(const address_t& address) { std::cout << std::format("{}\n", address); }
 
auto main() -> int {
  try {
    constexpr auto name = name_t{"John Doe"};
    constexpr auto address = address_t{"123 Main St."};
 
    print_name(name);
    print_address(address);
 
  } catch (const std::length_error& ex) {
    std::cerr << ex.what() << '\n';
  }
}