filter variant with functor predicate
map variant with functor predicate
Functor predicate constructor from static lambda
This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
Experimental!
std.algorithm alternative which accepts predicates as functors https://forum.dlang.org/post/qnigarkuxxnqwdernhzv@forum.dlang.org