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MethodHandles.DropArguments Method

  • Reference

Definition

Namespace:
Java.Lang.Invoke
Assembly:
Mono.Android.dll

Overloads

DropArguments(MethodHandle, Int32, Class[])

Produces a method handle which will discard some dummy arguments before calling some other specified target method handle.
DropArguments(MethodHandle, Int32, IList<Class>)

Produces a method handle which will discard some placeholder arguments before calling some other specified target method handle.

DropArguments(MethodHandle, Int32, Class[])

Produces a method handle which will discard some dummy arguments before calling some other specified target method handle.

[Android.Runtime.Register("dropArguments", "(Ljava/lang/invoke/MethodHandle;I[Ljava/lang/Class;)Ljava/lang/invoke/MethodHandle;", "", ApiSince=26)]
public static Java.Lang.Invoke.MethodHandle? DropArguments (Java.Lang.Invoke.MethodHandle? target, int pos, params Java.Lang.Class[]? valueTypes);
[<Android.Runtime.Register("dropArguments", "(Ljava/lang/invoke/MethodHandle;I[Ljava/lang/Class;)Ljava/lang/invoke/MethodHandle;", "", ApiSince=26)>]
static member DropArguments : Java.Lang.Invoke.MethodHandle * int * Java.Lang.Class[] -> Java.Lang.Invoke.MethodHandle

Parameters

target
MethodHandle

the method handle to invoke after the arguments are dropped

pos
Int32

position of first argument to drop (zero for the leftmost)

valueTypes
Class[]

the type(s) of the argument(s) to drop

Returns

MethodHandle

a method handle which drops arguments of the given types, before calling the original method handle

Attributes
RegisterAttribute

Remarks

Java documentation for java.lang.invoke.MethodHandles.dropArguments(java.lang.invoke.MethodHandle, int, java.lang.Class).

Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.

Applies to

DropArguments(MethodHandle, Int32, IList<Class>)

Produces a method handle which will discard some placeholder arguments before calling some other specified target method handle.

[Android.Runtime.Register("dropArguments", "(Ljava/lang/invoke/MethodHandle;ILjava/util/List;)Ljava/lang/invoke/MethodHandle;", "", ApiSince=26)]
public static Java.Lang.Invoke.MethodHandle? DropArguments (Java.Lang.Invoke.MethodHandle? target, int pos, System.Collections.Generic.IList<Java.Lang.Class>? valueTypes);
[<Android.Runtime.Register("dropArguments", "(Ljava/lang/invoke/MethodHandle;ILjava/util/List;)Ljava/lang/invoke/MethodHandle;", "", ApiSince=26)>]
static member DropArguments : Java.Lang.Invoke.MethodHandle * int * System.Collections.Generic.IList<Java.Lang.Class> -> Java.Lang.Invoke.MethodHandle

Parameters

target
MethodHandle

the method handle to invoke after the arguments are dropped

pos
Int32

position of first argument to drop (zero for the leftmost)

valueTypes
IList<Class>

the type(s) of the argument(s) to drop

Returns

MethodHandle

a method handle which drops arguments of the given types, before calling the original method handle

Attributes
RegisterAttribute

Remarks

Produces a method handle which will discard some placeholder arguments before calling some other specified target method handle. The type of the new method handle will be the same as the target's type, except it will also include the placeholder argument types, at some given position.

The pos argument may range between zero and N, where N is the arity of the target. If pos is zero, the placeholder arguments will precede the target's real arguments; if pos is N they will come after.

<b>Example:</b> <blockquote>

{@code
            import static java.lang.invoke.MethodHandles.*;
            import static java.lang.invoke.MethodType.*;
            ...
            MethodHandle cat = lookup().findVirtual(String.class,
              "concat", methodType(String.class, String.class));
            assertEquals("xy", (String) cat.invokeExact("x", "y"));
            MethodType bigType = cat.type().insertParameterTypes(0, int.class, String.class);
            MethodHandle d0 = dropArguments(cat, 0, bigType.parameterList().subList(0,2));
            assertEquals(bigType, d0.type());
            assertEquals("yz", (String) d0.invokeExact(123, "x", "y", "z"));
            }

</blockquote>

This method is also equivalent to the following code: <blockquote>

{@link #dropArguments(MethodHandle,int,Class...) dropArguments}{@code (target, pos, valueTypes.toArray(new Class[0]))}

</blockquote>

Java documentation for java.lang.invoke.MethodHandles.dropArguments(java.lang.invoke.MethodHandle, int, java.util.List<java.lang.Class<?>>).

Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.

Applies to