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Add meta.transform package 

Templates in this module applied to a type produce a transformed type.
This commit is contained in:
Eugen Wissner 2017-08-13 19:12:46 +02:00
parent 64f2295d1a
commit a5026e48d8
2 changed files with 129 additions and 0 deletions
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/* 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/. */
/**
* Template metaprogramming.
*
* Copyright: Eugene Wissner 2017.
* 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)
* Source: $(LINK2 https://github.com/caraus-ecms/tanya/blob/master/source/tanya/meta/package.d,
* tanya/meta/package.d)
*/
module tanya.meta;
public import tanya.meta.transform;

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/* 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/. */
/**
* Type transformations.
*
* Templates in this module applied to a type produce a transformed type.
*
* Copyright: Eugene Wissner 2017.
* 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)
* Source: $(LINK2 https://github.com/caraus-ecms/tanya/blob/master/source/tanya/meta/transform.d,
* tanya/meta/transform.d)
*/
module tanya.meta.transform;
/**
* Removes any type qualifiers from $(D_PARAM T).
*
* Removed qualifiers are:
* $(UL
* $(LI const)
* $(LI immutable)
* $(LI inout)
* $(LI shared)
* )
* and combinations of these.
*
* If the type $(D_PARAM T) doesn't have any qualifieres,
* $(D_INLINECODE Unqual!T) becomes an alias for $(D_PARAM T).
*
* Params:
* T = A type.
*/
template Unqual(T)
{
static if (is(T U == const U)
|| is(T U == immutable U)
|| is(T U == inout U)
|| is(T U == inout const U)
|| is(T U == shared U)
|| is(T U == shared const U)
|| is(T U == shared inout U)
|| is(T U == shared inout const U))
{
alias Unqual = U;
}
else
{
alias Unqual = T;
}
}
///
pure nothrow @safe @nogc unittest
{
static assert(is(Unqual!bool == bool));
static assert(is(Unqual!(immutable bool) == bool));
static assert(is(Unqual!(inout bool) == bool));
static assert(is(Unqual!(inout const bool) == bool));
static assert(is(Unqual!(shared bool) == bool));
static assert(is(Unqual!(shared const bool) == bool));
static assert(is(Unqual!(shared inout const bool) == bool));
}
/**
* If $(D_PARAM T) is an $(D_KEYWORD enum), $(D_INLINECODE OriginalType!T) evaluates to the
* most base type of that $(D_KEYWORD enum) and to $(D_PARAM T) otherwise.
*
* Params:
* T = A type.
*/
template OriginalType(T)
{
static if (is(T U == enum))
{
alias OriginalType = OriginalType!U;
}
else
{
alias OriginalType = T;
}
}
///
pure nothrow @safe @nogc unittest
{
enum E1 : const(int)
{
n = 0,
}
enum E2 : bool
{
t = true,
}
enum E3 : E2
{
t = E2.t,
}
enum E4 : const(E2)
{
t = E2.t,
}
static assert(is(OriginalType!E1 == const int));
static assert(is(OriginalType!E2 == bool));
static assert(is(OriginalType!E3 == bool));
static assert(is(OriginalType!E4 == bool));
static assert(is(OriginalType!(const E4) == bool));
}