accessQualifiers
accessQualifiers
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Access Qualifiers Access Qualifiers for image memory objects.

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__read_only __write_only read_only write_only

## Description

Image objects specified as arguments to a kernel can be declared to be read-only or write-only. A kernel cannot read from and write to the same image object. The `__read_only` (or `read_only`) and `__write_only` (or `write_only`) qualifiers must be used with image object arguments to declare if the image object is being read or written by a kernel. The default qualifier is `__read_only`.

## Notes

The `__read_only`, `__write_only`, `__read_write`, `read_only`, `write_only` and `read_write` names are reserved for use as access qualifiers and shall not be used otherwise.

## Example

In the example below, `imageA` is a read-only 2D image object, and `imageB` is a write-only 2D image object.

__kernel void foo (read_only image2d_t imageA, write_only image2d_t imageB) { ... }

## Specification

OpenCL Specification

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