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Explain the IntelliSense/C++20-module preprocessor block in Base code #478

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Explain the IntelliSense/C++20-module preprocessor block in Base code #478

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13 changes: 13 additions & 0 deletions en/03_Drawing_a_triangle/00_Setup/00_Base_code.adoc
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Expand Up @@ -38,6 +38,19 @@ import vulkan_hpp;
#include <cstdlib>

class HelloTriangleApplication {
----

The `#if defined(__INTELLISENSE__) || !defined(USE_CPP20_MODULES)` block picks
between two ways of pulling in the Vulkan-Hpp API. When `USE_CPP20_MODULES` is
defined, we `import vulkan_hpp;` as a C++20 module. Visual Studio and VS Code's
IntelliSense engine doesn't yet understand `import` for modules and will flag
it as an error even though the code compiles fine, so we fall back to
including the traditional `<vulkan/vulkan_raii.hpp>` header whenever
`__INTELLISENSE__` is defined (which IntelliSense itself defines while
analyzing the code) or when modules are turned off entirely.

[,c++]
----
public:
void run() {
initVulkan();
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