Advanced C++20 Features

C++20 introduced major language and library improvements that make templates safer, ranges easier to compose, and large projects easier to organize.

Core Features Covered

• Concepts: constrain templates with clear requirements
• Ranges: compose lazy views and algorithms declaratively
• Modules: replace most header/include usage with faster, cleaner boundaries

Quick Example

#include <concepts>
#include <ranges>
#include <vector>

template <std::integral T>
T square(T x) { return x * x; }

int main() {
  std::vector<int> v{1, 2, 3, 4, 5};
  auto evenSquares = v
    | std::views::filter([](int n) { return n % 2 == 0; })
    | std::views::transform([](int n) { return n * n; });
}

Recommended Learning Order

1. Concepts
2. Ranges
3. Modules

[!TIP] Concepts and ranges are useful immediately in application code; modules are most impactful at project scale.