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Alias std.meta.Filter

Filters an AliasSeq using a template predicate. Returns an AliasSeq of the elements which satisfy the predicate.

alias Filter(alias pred, args...) = AliasSeq!();


import std.traits : isNarrowString, isUnsigned;

alias Types1 = AliasSeq!(string, wstring, dchar[], char[], dstring, int);
alias TL1 = Filter!(isNarrowString, Types1);
static assert(is(TL1 == AliasSeq!(string, wstring, char[])));

alias Types2 = AliasSeq!(int, byte, ubyte, dstring, dchar, uint, ulong);
alias TL2 = Filter!(isUnsigned, Types2);
static assert(is(TL2 == AliasSeq!(ubyte, uint, ulong)));


Walter Bright, David Nadlinger


Boost License 1.0.