http://d.puremagic.com/issues/show_bug.cgi?id=8978
Summary: Constructor is called instead of implicit cast when
initializing from expression tuple
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Keywords: wrong-code
Severity: normal
Priority: P2
Component: DMD
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from Denis Shelomovskij <[email protected]> 2012-11-08
16:26:34 MSK ---
The second `static assert` fails as `this(const S)` is called:
---
template expressionTuple(expressions...)
{ alias expressions expressionTuple; }
struct S
{
int* p;
this(const S) { }
}
void main()
{
const S cs;
static assert(!__traits(compiles, { S s = cs; })); // ok, cast is invalid
alias expressionTuple!(cs) args;
static assert(!__traits(compiles, { S s = args; })); // fails
}
---
Another example:
---
template expressionTuple(expressions...)
{ alias expressions expressionTuple; }
struct S
{
int i;
this(S) { assert(0); }
}
void main()
{
alias expressionTuple!(S()) args;
S s = args; // `assert(0);` is triggered
}
---
Workaround:
---
alias expressionTuple!(...) args;
static if(args.length == 1)
S s = args[0];
else
S s = args;
---
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