On Wednesday, 16 March 2016 at 16:40:49 UTC, Shachar Shemesh
wrote:
Please consider the following program, which is a reduced
version of a problem I've spent the entire of today trying to
debug:
import std.stdio;
void main() {
enum ulong MAX_VAL = 256;
long value = -500;
if( value>MAX_VAL )
value = MAX_VAL;
writeln(value);
}
People who are marginally familiar with integer promotion will
not be surprised to know that the program prints "256". What is
surprising to me is that this produced neither error nor
warning.
The comparable program in C++, when compiled with gcc,
correctly warns about signed/unsigned comparison (though, to be
fair, it seems that clang doesn't).
Yep. Integer promotions in D sucks! I like this example:
import std.stdio;
void main()
{
short a = 10;
short b = 5;
short c = a - b;
}
It gives error: Error: cannot implicitly convert expression
(cast(int)a - cast(int)b) of type int to short
Why I can't substract two values of the same type and assign to
the variable of the same type directly without casts?! What a
nonsense!?
