Comparing D vs C++ (wierd behaviour of C++)

[Daniel Kozak]

I am not C++ expert so this seems wierd to me:

#include <iostream>
#include <string>

using namespace std;

int main(int argc, char **argv)
{
	char c = 0xFF;
	std::string sData = {c,c,c,c};
	unsigned int i = (((((sData[0]&0xFF)*256
					+ (sData[1]&0xFF))*256)
					+ (sData[2]&0xFF))*256
					+ (sData[3]&0xFF));
					
	if (i != 0xFFFFFFFF) { // it is true why?
		// this print 18446744073709551615 wow
		std::cout << "WTF: " << i  << std::endl;
	}	    	
	return 0;
}

compiled with:
g++ -O2 -Wall  -o "test" "test.cxx"
when compiled with -O0 it works as expected

Vs. D:

import std.stdio;

void main(string[] args)
{
	char c = 0xFF;
	string sData = [c,c,c,c];
	uint i = (((((sData[0]&0xFF)*256
					+ (sData[1]&0xFF))*256)
					+ (sData[2]&0xFF))*256
					+ (sData[3]&0xFF));
	if (i != 0xFFFFFFFF) { // is false - make sense
		writefln("WTF: %d", i);
	}			
}

compiled with:
dmd -release -inline -boundscheck=off -w -of"test" "test.d"

So it is code gen bug on c++ side, or there is something wrong 
with that code.