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Move Smallest and Largest to meta.transform

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Smallest and Largest choose the smallest or largest (according to
.sizeof property) type in the list of types. These templates get a list
of types and produce a type, so they are transformations.
This commit is contained in:
Eugen Wissner
2018-05-02 15:50:28 +02:00
parent 4f6ce116bc
commit cd1a38f402
2 changed files with 83 additions and 40 deletions
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45
source/tanya/meta/trait.d
View File

@@ -70,17 +70,7 @@ enum bool isWideString(T) = is(T : const dchar[]) && !isStaticArray!T;
static assert(!isWideString!(dchar[10]));
}
/**
* Finds the type with the smallest size in the $(D_PARAM Args) list. If
* several types have the same type, the leftmost is returned.
*
* Params:
* Args = Type list.
*
* Returns: The smallest type.
*
* See_Also: $(D_PSYMBOL Largest).
*/
deprecated("Use tanya.meta.transform.Smallest instead")
template Smallest(Args...)
if (Args.length >= 1)
{
@@ -100,15 +90,6 @@ if (Args.length >= 1)
}
}
///
@nogc nothrow pure @safe unittest
{
static assert(is(Smallest!(int, ushort, uint, short) == ushort));
static assert(is(Smallest!(short) == short));
static assert(is(Smallest!(ubyte[8], ubyte[5]) == ubyte[5]));
static assert(!is(Smallest!(short, 5)));
}
/**
* Determines whether $(D_PARAM T) is a complex type.
*
@@ -185,6 +166,9 @@ enum bool isPolymorphicType(T) = is(T == class) || is(T == interface);
}
/**
* Determines whether the type $(D_PARAM T) has a static method
* named $(D_PARAM member).
*
* Params:
* T = Aggregate type.
* member = Symbol name.
@@ -944,17 +928,7 @@ template mostNegative(T)
static assert(mostNegative!cfloat == -cfloat.max);
}
/**
* Finds the type with the largest size in the $(D_PARAM Args) list. If several
* types have the same type, the leftmost is returned.
*
* Params:
* Args = Type list.
*
* Returns: The largest type.
*
* See_Also: $(D_PSYMBOL Smallest).
*/
deprecated("Use tanya.meta.transform.Largest instead")
template Largest(Args...)
if (Args.length >= 1)
{
@@ -974,15 +948,6 @@ if (Args.length >= 1)
}
}
///
@nogc nothrow pure @safe unittest
{
static assert(is(Largest!(int, short, uint) == int));
static assert(is(Largest!(short) == short));
static assert(is(Largest!(ubyte[8], ubyte[5]) == ubyte[8]));
static assert(!is(Largest!(short, 5)));
}
/**
* Determines whether the type $(D_PARAM T) is copyable.
*

78
source/tanya/meta/transform.d
View File

@@ -901,3 +901,81 @@ if (allSatisfy!(isType, Args))
static assert(is(CommonType!(S, int) == void));
static assert(is(CommonType!(const S, S) == const S));
}
/**
* Finds the type with the smallest size in the $(D_PARAM Args) list. If
* several types have the same type, the leftmost is returned.
*
* Params:
* Args = Type list.
*
* Returns: The smallest type.
*
* See_Also: $(D_PSYMBOL Largest).
*/
template Smallest(Args...)
if (Args.length >= 1)
{
static assert(is(Args[0]), T.stringof ~ " doesn't have .sizeof property");
static if (Args.length == 1)
{
alias Smallest = Args[0];
}
else static if (Smallest!(Args[1 .. $]).sizeof < Args[0].sizeof)
{
alias Smallest = Smallest!(Args[1 .. $]);
}
else
{
alias Smallest = Args[0];
}
}
///
@nogc nothrow pure @safe unittest
{
static assert(is(Smallest!(int, ushort, uint, short) == ushort));
static assert(is(Smallest!(short) == short));
static assert(is(Smallest!(ubyte[8], ubyte[5]) == ubyte[5]));
static assert(!is(Smallest!(short, 5)));
}
/**
* Finds the type with the largest size in the $(D_PARAM Args) list. If several
* types have the same type, the leftmost is returned.
*
* Params:
* Args = Type list.
*
* Returns: The largest type.
*
* See_Also: $(D_PSYMBOL Smallest).
*/
template Largest(Args...)
if (Args.length >= 1)
{
static assert(is(Args[0]), T.stringof ~ " doesn't have .sizeof property");
static if (Args.length == 1)
{
alias Largest = Args[0];
}
else static if (Largest!(Args[1 .. $]).sizeof > Args[0].sizeof)
{
alias Largest = Largest!(Args[1 .. $]);
}
else
{
alias Largest = Args[0];
}
}
///
@nogc nothrow pure @safe unittest
{
static assert(is(Largest!(int, short, uint) == int));
static assert(is(Largest!(short) == short));
static assert(is(Largest!(ubyte[8], ubyte[5]) == ubyte[8]));
static assert(!is(Largest!(short, 5)));
}