On Thursday, 26 May 2016 at 14:03:16 UTC, ArturG wrote:
for example:
if(any floatingpoint.init) will be true
if(any char.init) also true
if("") also true
while others are false e.g.
string s;
if(s) will be false
all others are also false or did i miss any?
It's a shortcut that works for certain type and that means:
- pointers: if (ptr) <=> if (ptr != null)
- pointers: if (!ptr) <=> if (ptr == null)
- integral(*): if (i) <=> if (i > 0)
- integral: if (!i) <=> if (i == 0)
- classes: if (c) <=> if (c !is null)
- classes: if (!c) <=> if (c is null)
(*) integral: generally speaking so: byte, ubyte, short, ushort,
int, uint, long, ulong, char, wchar, dchar and also, very special
case, structs with an alias this to one of this integral type.
for array this works and this tests the (.ptr) member but most of
the people here (incl. me) would recommand rather to always do:
"if (arr.length)"
because in some cases "if (arr)" will yield "true" even if the
length is equal to 0.
