What is new in C++20?

• Concepts: named rules for templates.
• Ranges and views: pipelines like v | views::filter(...) | views::transform(...).
• Modules: a modern replacement for header files.
• Coroutines: functions which can pause and continue.
• std::format: type safe formatting.
• Spaceship operator <=>: all comparisons with one function.
• std::span, std::jthread, designated initializers and more.

#include <format>
#include <iostream>
#include <ranges>
#include <span>
#include <vector>

struct Point { int x; int y; };

int main() {
    Point p{.x = 1, .y = 2};                                              // designated initializers
    std::vector<int> v = {1, 2, 3, 4, 5, 6};
    auto evens = v | std::views::filter([](int n) { return n % 2 == 0; });
    std::span<const int> view{v};
    std::cout << std::format("{} {} {} {}\n", p.x + p.y, *evens.begin(), view.size(), (1 <=> 2) < 0);
}

See Modern C++ Features.

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