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4003CEM-continued/input.h
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#ifndef INPUT_H | |
#define INPUT_H | |
#include <sstream> | |
#include <string> | |
#include <stdexcept> | |
#include <limits> | |
#include <iostream> | |
/* Getting input from the user in C++ is simply a matter | |
of saying: | |
int value; | |
std::cin >> value; | |
However, getting C++ to handle invalid input is | |
surprisingly complex. So here is a input() function | |
that I have written that does it all for you. | |
It behaves in a similar way to input() in Python | |
and will raise a runtime_error exception if the user | |
trys to enter anything that can't be converted to the | |
correct type. You don't need to know how this work at | |
the moment, just type... | |
int value = input<int>(); | |
... to read in ints or ... | |
float value = input<float>(); | |
..if you watch to read floats etc. . */ | |
template<typename T> | |
T input() | |
{ | |
T value; | |
std::cin >> value; | |
if( std::cin.fail() ) | |
{ | |
std::cin.clear(); | |
std::cin.ignore( std::numeric_limits<std::streamsize>::max(), '\n' ); | |
throw std::runtime_error("Input is of invalid type"); | |
} | |
return value; | |
} | |
#endif |