# VK_USE_64_BIT_PTR_DEFINES(3) Manual Page

## Name

VK_USE_64_BIT_PTR_DEFINES - Defines whether non-dispatchable handles are a 64-bit pointer type or a 64-bit unsigned integer type

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## C Specification

`VK_USE_64_BIT_PTR_DEFINES` defines whether the default non-dispatchable handles are declared using either a 64-bit pointer type or a 64-bit unsigned integer type.

`VK_USE_64_BIT_PTR_DEFINES` is set to '1' to use a 64-bit pointer type or any other value to use a 64-bit unsigned integer type.

    // Provided by VK_VERSION_1_0
    #ifndef VK_USE_64_BIT_PTR_DEFINES
        #if defined(__LP64__) || defined(_WIN64) || (defined(__x86_64__) && !defined(__ILP32__) ) || defined(_M_X64) || defined(__ia64) || defined (_M_IA64) || defined(__aarch64__) || defined(__powerpc64__) || (defined(__riscv) && __riscv_xlen == 64)
            #define VK_USE_64_BIT_PTR_DEFINES 1
        #else
            #define VK_USE_64_BIT_PTR_DEFINES 0
        #endif
    #endif

## Description

Note | The `vulkan_core.h` header allows the `VK_USE_64_BIT_PTR_DEFINES` definition to be overridden by the application. This allows the application to select either a 64-bit pointer type or a 64-bit unsigned integer type for non-dispatchable handles in the case where the predefined preprocessor check does not identify the desired configuration.

Note | This macro was introduced starting with the Vulkan 1.2.174 headers, and its availability can be checked at compile time by requiring ``VK_HEADER_VERSION` >= 174`. It is not available if you are using older headers, such as may be shipped with an older Vulkan SDK. Developers requiring this functionality may wish to include a copy of the current Vulkan headers with their project in this case.

## See Also

VK_NULL_HANDLE, VK_VERSION_1_0

## Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

## Copyright

Copyright 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0