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Reintroduce isStruct, isClass and isInterface

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since they can be useful for generic programming.
This commit is contained in:
Eugen Wissner 2017-11-29 19:53:28 +01:00
parent 7e7bf40f70
commit 9e16d84f9e
1 changed files with 27 additions and 3 deletions
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30
source/tanya/meta/trait.d
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@ -275,13 +275,37 @@ enum bool isTemplate(alias T) = __traits(isTemplate, T);
static assert(!isTemplate!(S!int));
}
deprecated("Use is(T == interface) instead")
/**
* Tests whether $(D_PARAM T) is an interface.
*
* Params:
* T = A type.
*
* Returns: $(D_KEYWORD true) if $(D_PARAM T) is an interface,
* $(D_KEYWORD false) otherwise.
*/
enum bool isInterface(T) = is(T == interface);
deprecated("Use is(T == class) instead")
/**
* Tests whether $(D_PARAM T) is a class.
*
* Params:
* T = A type.
*
* Returns: $(D_KEYWORD true) if $(D_PARAM T) is a class,
* $(D_KEYWORD false) otherwise.
*/
enum bool isClass(T) = is(T == class);
deprecated("Use is(T == struct) instead")
/**
* Tests whether $(D_PARAM T) is a struct.
*
* Params:
* T = A type.
*
* Returns: $(D_KEYWORD true) if $(D_PARAM T) is a struct,
* $(D_KEYWORD false) otherwise.
*/
enum bool isStruct(T) = is(T == struct);
/**