Bug 12172 – Refused sum(transversal)

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)

Sum doesn't allow for a seed like reduce. Is this meant to be an enhancement request, or just a mistake? FWIW: sum(data.transversal(0)) works fine.

(In reply to comment #1) > Sum doesn't allow for a seed like reduce. Is this meant to be an enhancement > request, or just a mistake? Probably it's just a mistake, sorry. Closed.