fig07_06.cpp

// fig07_06.cpp
// C++20: Creating std::arrays with to_array.
#include <fmt/format.h>
#include <iostream>
#include <array>

int main() {
   // generic lambda to display a collection of items
   const auto display{
      [](const auto& items) {
         for (const auto& item : items) {
            std::cout << fmt::format("{} ", item);
         }
      }
   };

   const int values1[]{10, 20, 30};

   // creating a std::array from a built-in array
   const auto array1{std::to_array(values1)};

   std::cout << fmt::format("array1.size() = {}\n", array1.size())
      << "array1: ";
   display(array1); // use lambda to display contents

   // creating a std::array from an initializer list
   const auto array2{std::to_array({1, 2, 3, 4})};
   std::cout << fmt::format("\n\narray2.size() = {}\n", array2.size())
      << "array2: ";
   display(array2); // use lambda to display contents

   std::cout << '\n';
}


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