Likely and Unlikely attribute

Likely and Unlikely attribute

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In C++20 [[unlikely]], [[likely]] attributes can be applied to statements, they allow the compiler to paths of execution

double pow(double a, int b) {
  if (n > 0) [[likely]] {
    return x * pow(a, b - 1);
  }
  else [[unlikely]] {
    return 1;
  }
}