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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
* template arguments.
*
* Copyright: Eugene Wissner 2017.
* Copyright: Eugene Wissner 2017-2018.
* License: $(LINK2 https://www.mozilla.org/en-US/MPL/2.0/,
* Mozilla Public License, v. 2.0).
* Authors: $(LINK2 mailto:info@caraus.de, Eugene Wissner)
@ -232,19 +232,21 @@ if (Tuples.length > 0
*
* See_Also: $(D_PSYMBOL AliasSeq).
*/
template Tuple(Args...)
struct Tuple(Args...)
{
/// Elements in this tuple as $(D_PSYMBOL AliasSeq).
alias Seq = Args;
/// The length of the tuple.
enum size_t length = Args.length;
alias Seq this;
}
///
@nogc nothrow pure @safe unittest
{
alias A = Tuple!(short);
alias A = Tuple!short;
alias B = Tuple!(3, 8, 9);
alias C = Tuple!(A, B);
@ -263,20 +265,22 @@ template Tuple(Args...)
/**
* 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
* for determining if two items are equal.
*
* Params:
* Args = Elements of this $(D_PSYMBOL Tuple).
*/
template Set(Args...)
struct Set(Args...)
{
/// Elements in this set as $(D_PSYMBOL AliasSeq).
alias Seq = NoDuplicates!Args;
/// The length of the set.
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:
* T = Template.
@ -1634,7 +1638,8 @@ template Filter(alias pred, L...)
///
@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
{
alias Types = AliasSeq!(int, uint, int, short, short, uint);
static assert(is(NoDuplicates!Types == AliasSeq!(int, uint, short)));
alias Given = AliasSeq!(int, uint, int, short, short, uint);
static assert(is(NoDuplicates!Given == AliasSeq!(int, uint, short)));
}
/**