问如何找出某个标准C++函数的实现细节？

EN

struct Generator{
  Generator() : val(0), count(0) {}
  Generator(std::mt19937&& aGen) : val(0), count(0), theGen(aGen) {}
  long long int operator()(void){
    val = theGen();
    std::cout << val << " " << count << std::endl;
    ++count;
    return val;
  }
  long long int max(){return theGen.max();};
  long long int min(){return theGen.min();};
  long long int val;
  size_t count;
  std::mt19937 theGen;
}; 

std::normal_distribution<> dis(1.0, 2.0);
Generator gen(std::mt19937 (42));
dis(gen);