Update 02_Validation_layers.md

idlewan · web-flow · commit d0d958a74fde · 2016-11-10T15:37:13.000Z
The address of the callback should be passed to the function instead of the callback itself, otherwise it doesn't compile.
diff --git a/03_Drawing_a_triangle/00_Setup/02_Validation_layers.md b/03_Drawing_a_triangle/00_Setup/02_Validation_layers.md
@@ -315,7 +315,7 @@ couldn't be loaded. We can now call this function to create the extension
 object if it's available:
 
 ```c++
-if (CreateDebugReportCallbackEXT(instance, &createInfo, nullptr, callback) != VK_SUCCESS) {
+if (CreateDebugReportCallbackEXT(instance, &createInfo, nullptr, &callback) != VK_SUCCESS) {
     throw std::runtime_error("failed to set up debug callback!");
 }
 ```

Original file line number	Diff line number	Diff line change
`@@ -315,7 +315,7 @@ couldn't be loaded. We can now call this function to create the extension`
`315`	`315`	`object if it's available:`
`316`	`316`
`317`	`317`	```c++
`318`		`-if (CreateDebugReportCallbackEXT(instance, &createInfo, nullptr, callback) != VK_SUCCESS) {`
	`318`	`+if (CreateDebugReportCallbackEXT(instance, &createInfo, nullptr, &callback) != VK_SUCCESS) {`
`319`	`319`	`throw std::runtime_error("failed to set up debug callback!");`
`320`	`320`	`}`
`321`	`321`	```