a printf-like printer for arbitrary types

printer.cpp

#include <cstdio>

class Printer;

class Printable {
public:
	virtual void print (Printer& printer) const = 0;
};

class Printer {
	FILE* file;
public:
	Printer (FILE* file = stdout): file(file) {}
	void print (const char* s) {
		fputs (s, file);
	}
	void print (int n) {
		fprintf (file, "%d", n);
	}
	void print (const Printable& p) {
		p.print (*this);
	}
	template <class T0, class... T> void print (const char* s, const T0& v0, const T&... v) {
		while (true) {
			if (*s == '\0') return;
			if (*s == '%') {
				++s;
				if (*s != '%') break;
			}
			fputc (*s, file);
			++s;
		}
		print (v0);
		print (s, v...);
	}
};