new_hex_print

hex_print.h

#include <iostream>
#include <iomanip>

template <typename T, size_t Size = sizeof(T)>
struct HexPrintable {
	static void hex_print(T v) {
		union {
			T original;
			uint8_t printing[Size];
		} value;
		
		value.original = v;
		std::cout << "0x";
		for(int i = Size - 1; 0 <= i; i--) std::cout << std::hex << std::setfill('0') << std::setw(2) << std::uppercase << static_cast<uint16_t>(value.printing[i]);
		std::cout << std::endl;
	}
};

// for long double on OSX/Xcode/Clang (it looks like 80bit float. maybe... )
// but on other environments... i don't know...
template <>
struct HexPrintable<long double, 16> : HexPrintable<long double, 10> {};

template <typename T>
void hex_print(T v) {
	HexPrintable<T>::hex_print(v);
}

test.cpp

#include "hex_print.h"

using namespace std;
int main(int argc, char *argv[]) {
	bool b = 0;
	hex_print(b);

	char c = 61;
	unsigned char uc = 61;
	hex_print(c);
	hex_print(uc);

	long double ld = 1.0l;
	float f = ld;
	double d = ld;
	hex_print(f);
	hex_print(d);
	hex_print(ld);
	
	return EXIT_SUCCESS;
}