? / professional-program-22-FunctionObjects-WritingFunctionObject.c
include <functional> include <algorithm> include <cctype> include <string> include <iostream> using namespace std; class myIsDigit : public unary_function<char, bool> { public: bool operator() (char c) const { 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); }
(C) Æliens 20/2/2008
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