[C++Quiz]#185、#207、#219

Question #219

#include <iostream>

template<typename T>
T sum(T arg) {
    return arg;   
}

template<typename T, typename ...Args>
T sum(T arg, Args... args) {    
    return arg + sum<T>(args...);
}

int main() {
    auto n1 = sum(0.5, 1, 0.5, 1);
    auto n2 = sum(1, 0.5, 1, 0.5);
    std::cout << n1 << n2;
}

Question #207

#include <iostream>
#include <map>
using namespace std;

int main() {
    map<int, int> m;
    cout << m[42];
}

Question #185

#include <iostream>

template <typename T> void f() {
  static int stat = 0;
  std::cout << stat++;
}

int main() {
  f<int>();
  f<int>();
  f<const int>();
}