On Wednesday, 3 February 2016 at 17:40:23 UTC, Meta wrote:
On Wednesday, 3 February 2016 at 17:12:03 UTC, xtreak wrote:
I was reporting a patch for the regression by removing the
code that was causing the error. The bug was that map was not
accepting multiple lambdas. It was suggested to check for void
functions and lambdas. I couldn't find a function to check for
return type in the std.traits. I tried the explicit for loop
thus checking for the void functions as in the else case. I am
D newbie it will be helpful in having the community help me in
fixing the issue.
foreach(g, i; fun) {
alias k = unaryFun!(fun[g]);
static assert(!is(AppliedReturnType!k == void), "Mapping
function must not return void.");
}
Bug report : https://issues.dlang.org/show_bug.cgi?id=15480
Seems depends on :
https://issues.dlang.org/show_bug.cgi?id=5710
Pull request :
https://github.com/D-Programming-Language/phobos/pull/3963
Introduced as a part of
https://github.com/D-Programming-Language/phobos/pull/1917
Unles I'm misunderstanding you, you can get the return type of
a function by using std.traits.ReturnType:
void test() {}
static assert(is(ReturnType!test == void));
Thanks. I was trying to get the return type of lambdas. I was
trying the following and got an error. I was using dpaste with
dmd 2.070
writeln(ReturnType!(a =(a *a)))
Error: template instance f662.main.ReturnType!((a) => a * a) does
not match template declaration ReturnType(func...) if
(func.length == 1 && isCallable!func)
