Ruby
3.4.0dev (2024-12-06 revision 892c46283a5ea4179500d951c9d4866c0051f27b)
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Tweaking visibility of C variables/functions. More...
Go to the source code of this file.
Macros | |
#define | RUBY_EXTERN extern |
Declaration of externally visible global variables. More... | |
#define | RBIMPL_SYMBOL_EXPORT_BEGIN() /* void */ |
Shortcut macro equivalent to RUBY_SYMBOL_EXPORT_BEGIN extern "C" { . More... | |
#define | RBIMPL_SYMBOL_EXPORT_END() /* void */ |
Counterpart of RBIMPL_SYMBOL_EXPORT_BEGIN. More... | |
Tweaking visibility of C variables/functions.
RBIMPL
or rbimpl
are implementation details. Don't take them as canon. They could rapidly appear then vanish. The name (path) of this header file is also an implementation detail. Do not expect it to persist at the place it is now. Developers are free to move it anywhere anytime at will. __VA_ARGS__
is always available. We assume C99 for ruby itself but we don't assume languages of extension libraries. They could be written in C++98. Definition in file dllexport.h.
#define RBIMPL_SYMBOL_EXPORT_BEGIN | ( | ) | /* void */ |
Shortcut macro equivalent to RUBY_SYMBOL_EXPORT_BEGIN extern "C" {
.
@shyouhei finds it handy.
Definition at line 65 of file dllexport.h.
#define RBIMPL_SYMBOL_EXPORT_END | ( | ) | /* void */ |
Counterpart of RBIMPL_SYMBOL_EXPORT_BEGIN.
Definition at line 74 of file dllexport.h.
#define RUBY_EXTERN extern |
Declaration of externally visible global variables.
Here "externally" means they should be visible from extension libraries. Depending on operating systems (dynamic linkers, to be precise), global variables inside of a DLL may or may not be visible form outside of that DLL by default. This declaration manually tweaks that default and ensures the declared variable be truly globally visible.
Definition at line 45 of file dllexport.h.