Class template argument deduction

Use case

Cleaner standard library usage.

Explanation

CTAD lets us omit template arguments when the compiler can deduce them from constructor arguments.

Code

#include <iostream>
#include <vector>

int main() {
  std::vector addresses{0x1000, 0x1100, 0x1200};

  std::cout << "Vector size: " << addresses.size() << " \n";

  return 0;
}

View on GitHub.

Output

$ ./src/c++17/build/class-template-argument-deduction
Vector size: 3