static_local_bench.cc

#include <iostream>
#include <string>
#include <unordered_map>

using namespace std;

static const unordered_map<int, int> mapA{};

int funcA(int key) {
  auto f = mapA.find(key);
  if (f == mapA.end()) {
    return -9;
  } else {
    return f->second;
  }
}

unordered_map<int, int> mapB{};

int funcB(int key) {
  auto f = mapB.find(key);
  if (f == mapB.end()) {
    return -9;
  } else {
    return f->second;
  }
}



int funcC(int key) {
  static const unordered_map<int, int> map{};
  auto f = map.find(key);
  if (f == map.end()) {
    return -9;
  } else {
    return f->second;
  }
}

int funcD(int key) {
  unordered_map<int, int> map{};
  auto f = map.find(key);
  if (f == map.end()) {
    return -9;
  } else {
    return f->second;
  }
}

int main(int argc, char** argv) {
  char f = *argv[1];
  int key = stoi(string(argv[2]));
  int res = 0;
  if (f == 'A') {
    for (int i=0; i<100000000; ++i) {
       res += funcA(key);
    }
  }
  if (f == 'B') {
    for (int i=0; i<100000000; ++i) {
       res += funcB(key);
    }
  }
  if (f == 'C') {
    for (int i=0; i<100000000; ++i) {
       res += funcC(key);
    }
  }
  if (f == 'D') {
    for (int i=0; i<100000000; ++i) {
       res += funcD(key);
    }
  }
  cout << res << endl;
  return 0;
}