[Issue 4931] New: Implicit opCast!bool in if statement doesn't work with declarator
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Thu Sep 23 20:49:50 PDT 2010
http://d.puremagic.com/issues/show_bug.cgi?id=4931
Summary: Implicit opCast!bool in if statement doesn't work with
declarator
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Keywords: patch
Severity: normal
Priority: P2
Component: DMD
AssignedTo: nobody at puremagic.com
ReportedBy: rsinfu at gmail.com
--- Comment #0 from Shin Fujishiro <rsinfu at gmail.com> 2010-09-23 20:49:09 PDT ---
Created an attachment (id=772)
Patch against dmd r686
If an if statement has a variable declarator, a condition is implicitly
converted to bool before its value is assigned to the declared variable. The
following code doesn't compile:
--------------------
void main()
{
if (S s = S()) {} // (3)
}
struct S
{
bool opCast(T : bool)() { return true; }
}
--------------------
% dmd -o- -c test.d
test.d(3): Error: cannot implicitly convert expression (S().opCast()) of type
bool to S
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