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A multi-platform library for OpenGL, OpenGL ES and Vulkan development on the desktop. It provides a simple API for creating windows, contexts and surfaces, receiving input and events.

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/*
 * Copyright LWJGL. All rights reserved.
 * License terms: https://www.lwjgl.org/license
 * MACHINE GENERATED FILE, DO NOT EDIT
 */
package org.lwjgl.glfw;

import org.lwjgl.system.*;
import org.lwjgl.system.libffi.*;

import static org.lwjgl.system.APIUtil.*;
import static org.lwjgl.system.MemoryUtil.*;
import static org.lwjgl.system.libffi.LibFFI.*;

/**
 * The function pointer type for memory deallocation callbacks.
 * 
 * This is the function pointer type for memory deallocation callbacks. A memory deallocation callback function has the following signature:
 * 
 * 
 * void function_name(void* block, void* user)
 * 
 * This function may deallocate the specified memory block. This memory block will have been allocated with the same allocator.
 * 
 * This function may be called during {@link GLFW#glfwInit Init} but before the library is flagged as initialized, as well as during {@link GLFW#glfwTerminate Terminate} after the library is no
 * longer flagged as initialized.
 * 
 * The block address will never be {@code NULL}. Deallocations of {@code NULL} are filtered out before reaching the custom allocator.
 * 
 * Note
 * 
 * 
 * The specified memory block will not be accessed by GLFW after this function is called.
 * This function should not call any GLFW function.
 * This function may be called from any thread that calls GLFW functions.
 * 
 * 
 * Type
 * 
 * 
 * void (*{@link #invoke}) (
 *     void *block,
 *     void *user
 * )
 *
 * @since version 3.4
 */
@FunctionalInterface
@NativeType("GLFWdeallocatefun")
public interface GLFWDeallocateCallbackI extends CallbackI {

    FFICIF CIF = apiCreateCIF(
        FFI_DEFAULT_ABI,
        ffi_type_void,
        ffi_type_pointer, ffi_type_pointer
    );

    @Override
    default FFICIF getCallInterface() { return CIF; }

    @Override
    default void callback(long ret, long args) {
        invoke(
            memGetAddress(memGetAddress(args)),
            memGetAddress(memGetAddress(args + POINTER_SIZE))
        );
    }

    /**
     * Will be called for memory deallocation requests.
     *
     * @param block the address of the memory block to deallocate
     * @param user  the user-defined pointer from the allocator
     */
    void invoke(@NativeType("void *") long block, @NativeType("void *") long user);

}