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  1. #include <cmath>
  2. #include <iostream>
  3. using namespace std;
  4.  
  5. template <typename T>
  6. const auto PI = std::acos(static_cast<T>(-1));
  7.  
  8. int main() {
  9.   auto func = []() { cout << PI<float> << endl; };
  10.  
  11.   func();
  12. }
Success #stdin #stdout 0s 4452KB
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3.14159
https://ideone.com/P2bg5s
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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