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#include <iostream>
#include <ios>
#include <string>
#include <type_traits>
#include <vector>
#include <algorithm>
 
using namespace std ;
 
string getname(int x)
{
  switch (x)
  {
    case 0: return "zero";
    case 1: return "one";
    case 2: return "two";
  }
  return "I need to learn to count";
}
 
int getlength(const string& s)
{
  return s.length();
}
 
template <typename T, typename F>
auto execute(const T& t, F func) -> decltype(func(t))
{
  return func(t);
}
 
class XMAN
{
public:
    bool operator()(int i) const {
        return i > 3 && i < 8 && ( i % 2 ) ;
    }
};
 
int main()
{
    cout << execute("hello", getlength) << endl;
    cout << execute(1, getname) << endl;
 
    int myints[] = {9,8,7,6,5,4,3,2,1};
    std::vector<int> myvector (myints, myints+9);
    auto it = std::find_if( myvector.cbegin(),myvector.cend(),XMAN()) ;
    if( it != myvector.cend() )
        cout << *it << endl ;
    auto it2 = std::find_if( it+1,myvector.cend(),XMAN()) ;
    if( it != myvector.cend() )
        cout << *it2 << endl ;
    cout << "========================" << endl ;
    myvector.erase( remove_if(myvector.begin(),myvector.end(),XMAN()),myvector.end() ) ;
    for(auto it = myvector.begin();it != myvector.end();it++)
        cout << *it << endl ;
}
 
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