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Add meta.trait.hasFunctionAttributes

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This commit is contained in:
Eugen Wissner 2019-03-24 21:59:29 +01:00
parent 76f2cd7080
commit 2b8471fe34
2 changed files with 57 additions and 2 deletions
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4
meta/tanya/meta/metafunction.d
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@ -1779,7 +1779,7 @@ if (T.length == 2)
}
/**
* Attaces a numeric index to each element from $(D_PARAM Args).
* Attaches a numeric index to each element from $(D_PARAM Args).
*
* $(D_PSYMBOL EnumerateFrom) returns a sequence of tuples ($(D_PSYMBOL Pack)s)
* consisting of the index of each element and the element itself.
@ -1817,7 +1817,7 @@ template EnumerateFrom(size_t start, Args...)
}
/**
* Attaces a numeric index to each element from $(D_PARAM Args).
* Attaches a numeric index to each element from $(D_PARAM Args).
*
* $(D_PSYMBOL EnumerateFrom) returns a sequence of tuples ($(D_PSYMBOL Pack)s)
* consisting of the index of each element and the element itself.

55
meta/tanya/meta/trait.d
View File

@ -2257,6 +2257,61 @@ if (isCallable!F)
static assert((functionAttributes!func1 & FunctionAttribute.return_) == 0);
}
/**
* Determines whether a function has attribute.
*
* This template should get at least two arguments: the function itself and the
* attributes it should be tested for. If more than one attribute is given,
* $(D_PSYMBOL hasFunctionAttributes) evaluates to $(D_KEYWORD true) if all of
* them are present. The attributes should be $(D_PSYMBOL FunctionAttribute)
* members.
*
* Params:
* Args = The function and attributes.
*
* Returns:
*
* See_Also: $(D_PSYMBOL FunctionAttribute).
*/
template hasFunctionAttributes(Args...)
if (Args.length > 1
&& is(typeof(Args[1]) == FunctionAttribute)
&& isCallable!(Args[0])
&& allSameType!(Map!(TypeOf, Args[1 .. $])))
{
enum uint pred(Args_...) = Args_[0] | Args_[1];
template Reduce(Args_...)
{
static if (Args_.length == 1)
{
enum uint Reduce = Args_[0];
}
else
{
enum uint Reduce = Reduce!(pred!(Args_[0], Args_[1]), Args_[2 .. $]);
}
}
enum uint field = Reduce!(0, Args[1 .. $]);
enum hasFunctionAttributes = (functionAttributes!(Args[0]) & field) == field;
}
///
@nogc nothrow pure @safe unittest
{
static struct Range
{
@property auto front() inout
{
return 8;
}
}
static assert(hasFunctionAttributes!(Range.init.front, FunctionAttribute.inout_));
static assert(!hasFunctionAttributes!(Range.init.front, FunctionAttribute.const_));
static assert(!hasFunctionAttributes!(Range.init.front,
FunctionAttribute.inout_, FunctionAttribute.const_));
}
/**
* Returns a tuple with default values of the parameters to $(D_PARAM F).
*