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metafunction: Make Set and Tuple to structs

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It allows to use alias this to access the elements by index.
This commit is contained in:
Eugen Wissner 2018-03-20 17:16:55 +01:00
parent 363ebbe3df
commit 7af5b4db72
1 changed files with 14 additions and 9 deletions
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23
source/tanya/meta/metafunction.d
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@ -9,7 +9,7 @@
* It contains different algorithms for iterating, searching and modifying * It contains different algorithms for iterating, searching and modifying
* template arguments. * template arguments.
* *
* Copyright: Eugene Wissner 2017. * Copyright: Eugene Wissner 2017-2018.
* License: $(LINK2 https://www.mozilla.org/en-US/MPL/2.0/, * License: $(LINK2 https://www.mozilla.org/en-US/MPL/2.0/,
* Mozilla Public License, v. 2.0). * Mozilla Public License, v. 2.0).
* Authors: $(LINK2 mailto:info@caraus.de, Eugene Wissner) * Authors: $(LINK2 mailto:info@caraus.de, Eugene Wissner)
@ -232,19 +232,21 @@ if (Tuples.length > 0
* *
* See_Also: $(D_PSYMBOL AliasSeq). * See_Also: $(D_PSYMBOL AliasSeq).
*/ */
template Tuple(Args...) struct Tuple(Args...)
{ {
/// Elements in this tuple as $(D_PSYMBOL AliasSeq). /// Elements in this tuple as $(D_PSYMBOL AliasSeq).
alias Seq = Args; alias Seq = Args;
/// The length of the tuple. /// The length of the tuple.
enum size_t length = Args.length; enum size_t length = Args.length;
alias Seq this;
} }
/// ///
@nogc nothrow pure @safe unittest @nogc nothrow pure @safe unittest
{ {
alias A = Tuple!(short); alias A = Tuple!short;
alias B = Tuple!(3, 8, 9); alias B = Tuple!(3, 8, 9);
alias C = Tuple!(A, B); alias C = Tuple!(A, B);
@ -263,20 +265,22 @@ template Tuple(Args...)
/** /**
* Unordered sequence of unique aliases. * Unordered sequence of unique aliases.
* *
* $(D_PARAM Args) can contain duplicates, but they will be filteredout, so * $(D_PARAM Args) can contain duplicates, but they will be filtered out, so
* $(D_PSYMBOL Set) contains only unique items. $(D_PSYMBOL isEqual) is used * $(D_PSYMBOL Set) contains only unique items. $(D_PSYMBOL isEqual) is used
* for determining if two items are equal. * for determining if two items are equal.
* *
* Params: * Params:
* Args = Elements of this $(D_PSYMBOL Tuple). * Args = Elements of this $(D_PSYMBOL Tuple).
*/ */
template Set(Args...) struct Set(Args...)
{ {
/// Elements in this set as $(D_PSYMBOL AliasSeq). /// Elements in this set as $(D_PSYMBOL AliasSeq).
alias Seq = NoDuplicates!Args; alias Seq = NoDuplicates!Args;
/// The length of the set. /// The length of the set.
enum size_t length = Seq.length; enum size_t length = Seq.length;
alias Seq this;
} }
/// ///
@ -682,7 +686,7 @@ if (Args.length == 2)
} }
/** /**
* Instantiates the template $(D_PARAM T) with $(D_PARAM ARGS). * Instantiates the template $(D_PARAM T) with $(D_PARAM Args).
* *
* Params: * Params:
* T = Template. * T = Template.
@ -1634,7 +1638,8 @@ template Filter(alias pred, L...)
/// ///
@nogc nothrow pure @safe unittest @nogc nothrow pure @safe unittest
{ {
static assert(is(Filter!(isIntegral, real, int, bool, uint) == AliasSeq!(int, uint))); alias Given = AliasSeq!(real, int, bool, uint);
static assert(is(Filter!(isIntegral, Given) == AliasSeq!(int, uint)));
} }
/** /**
@ -1661,8 +1666,8 @@ template NoDuplicates(L...)
/// ///
@nogc nothrow pure @safe unittest @nogc nothrow pure @safe unittest
{ {
alias Types = AliasSeq!(int, uint, int, short, short, uint); alias Given = AliasSeq!(int, uint, int, short, short, uint);
static assert(is(NoDuplicates!Types == AliasSeq!(int, uint, short))); static assert(is(NoDuplicates!Given == AliasSeq!(int, uint, short)));
} }
/** /**