LearningCPP/main.cpp

#include <iostream>
#include <list>
#include <algorithm>
#include <map>
#include <iomanip>

using string = std::string;
using ilist = std::list<int>;

//Place in header!
template <typename T>
void printm(T m){
  std::cout << m;
}

template <typename T>
void printlm(T m){
  printm(m);
  printm("\n");
}

int prompti(string,bool*);
int prompti(string,bool*);
string prompts(string,bool*);
bool isneg(int);

int main() {
  printlm("Get the number of negatives from::");
  bool s {};
  ilist lst {};
  do {
    auto v = prompti("Enter an integer: ", &s);
    if (s) {
      lst.push_back(v);
    }
  } while (s);
  printm("Number of negatives (Defined): ");
  printlm(count_if(lst.cbegin(), lst.cend(), isneg));
  printm("Number of negatives (Lambda): ");
  printlm(count_if(lst.cbegin(), lst.cend(), [] (int x) { return x < 0;}));
  return 0;
}

int prompti(string message, bool *status) {
  int tr {};
  *status = false;
  std::cout << message;
  if (!(std::cin >> tr)){
    std::cin.clear();
    std::cin.ignore();
    return 0;
  }
  *status = true;
  return tr;
}

double promptd(string message, bool *status) {
  double tr {};
  *status = false;
  std::cout << message;
  if (!(std::cin >> tr)){
    std::cin.clear();
    std::cin.ignore();
    return 0.0;
  }
  *status = true;
  return tr;
}

string prompts(string message, bool *status) {
  string tr {""};
  *status = false;
  std::cout << message;
  if (!(std::cin >> tr)){
    std::cin.clear();
    std::cin.ignore();
    return "";
  }
  *status = true;
  return tr;
}

bool isneg(int x) {
  return x < 0;
}