https://d.puremagic.com/issues/show_bug.cgi?id=12172
Summary: Refused sum(transversal)
Product: D
Version: D2
Platform: x86
OS/Version: Windows
Status: NEW
Keywords: rejects-valid
Severity: normal
Priority: P2
Component: Phobos
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from [email protected] 2014-02-15 02:01:19 PST ---
import std.algorithm: reduce, sum;
import std.range: transversal;
alias mySum = reduce!q{a + b};
void main() {
const data = [[1, 2], [10, 20]];
mySum(0, data.transversal(0)); // OK
sum(0, data.transversal(0)); // Error
}
dmd 2.065beta3 gives:
test.d(7,8): Error: template std.algorithm.sum cannot deduce function from
argument types !()(int, Transversal!(const(int[])[],
cast(TransverseOptions)0)), candidates are:
...\dmd2\src\phobos\std\algorithm.d(1070,6): std.algorithm.sum(R)(R r)
if (isInputRange!R && !isFloatingPoint!(ElementType!R) && !isInfinite!R)
...\dmd2\src\phobos\std\algorithm.d(1115,6): std.algorithm.sum(R)(R r)
if (hasSlicing!R && hasLength!R && isFloatingPoint!(ElementType!R))
...\dmd2\src\phobos\std\algorithm.d(1145,6): std.algorithm.sum(R)(R r)
if (isInputRange!R && !(hasSlicing!R && hasLength!R) &&
isFloatingPoint!(ElementType!R) && !isInfinite!R)
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