write function object : Function Template « Function « C++

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C++ » Function » Function TemplateScreenshots 
write function object
  
#include <functional>
#include <algorithm>
#include <cctype>
#include <string>
#include <iostream>
using namespace std;

class myIsDigit : public unary_function<char, bool>{
public:
  bool operator() (char cconst return (::isdigit(c))}
};

bool isNumber(const string& str){
  string::const_iterator it = find_if(str.begin(), str.end(),not1(myIsDigit()));
  return (it == str.end());
}

int main(int argc, char** argv){

  cout << isNumber("12345"<< endl;
  cout << isNumber("hello"<< endl;
  cout << isNumber("1234a"<< endl;

  return (0);
}
  
    
  
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