c-resources/CPlusPlus20ForProgrammers-m.../examples/ch07/fig07_06.cpp

50 lines
1.9 KiB
C++

// 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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