Update run-time-library-behavior.md - inaccurate initialisation of AFX_EXTENSION_MODULE structure #2612
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The first two parameters of the structure AFX_EXTENSION_MODULE are BOOL and HMODULE. So initialization with = { NULL, NULL } is misleading: first NULL is FALSE (or 0 due to BOOL is defined as int). In fact this expression cannot be transformed to modern C++ equivalent = { nullptr, nullptr }.
struct AFX_EXTENSION_MODULE
{
BOOL bInitialized;
HMODULE hModule;
HMODULE hResource;
CRuntimeClass* pFirstSharedClass;
COleObjectFactory* pFirstSharedFactory;
};
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@yury-fedorov : Thanks for your contribution! The author(s) have been notified to review your proposed change. |
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@yury-fedorov |
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You are absolutely right. It is section 3.5.7 of the C89 specification. We
can keep it with default initialization.
…On Sat, Nov 21, 2020 at 12:44 PM Colin Robertson ***@***.***> wrote:
@yury-fedorov <https://github.com/yury-fedorov>
I'm confused why any initialization is required at all. Aren't global
statics zero-initialized by default? The struct AFX_EXTENSION_MODULE type
is POD and has no constructor.
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Adjusting the code after the feedback.
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@yury-fedorov : Thanks for your contribution! The author(s) have been notified to review your proposed change. |
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@corob-msft Could you please take a look on the new simplified version based on your feedback? |
colin-home
approved these changes
Nov 23, 2020
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The first two parameters of the structure AFX_EXTENSION_MODULE are BOOL and HMODULE. So initialisation with = { NULL, NULL } is inaccurate: first NULL is FALSE (or 0 due to BOOL is defined as int). In fact this expression cannot be transformed to modern C++ equivalent = { nullptr, nullptr }.
struct AFX_EXTENSION_MODULE
{
BOOL bInitialized;
HMODULE hModule;
HMODULE hResource;
CRuntimeClass* pFirstSharedClass;
COleObjectFactory* pFirstSharedFactory;
};