Sanitize with Templates and Callbacks.

sanitize.cpp

#include <iostream>
#include <string>

namespace utils {
	template< typename ParamType, typename Functor >
	ParamType sanitize(Functor callback, std::string entryMessage) {
		ParamType temp;
		do {
			std::cout << entryMessage;
		} while(!(std::cin >> temp) || !callback(temp));
		return temp;
	}
}

bool checkChoice(int temp) {
	return temp == 1 || temp == 2 || temp == 3;
}

int main() {
	int choice = utils::sanitize<int>(checkChoice, "Enter choice: ");

	std::cout << "Your choice is " << choice << '.' << std::endl;
}