Show how to call a function in a shared library (without dynamically linking to it at compile-time). In particular, show how to call the shared library function if the library is available, otherwise use an internal equivalent function.

This is a special case of calling a foreign language function where the focus is close to the ABI level and not at the normal API level.



Related task

 OpenGL -- OpenGL is usually maintained as a shared library.


pragma(lib, "user32.lib");
 
import std.stdio, std.c.windows.windows;
 
extern(Windows) UINT GetDoubleClickTime();
 
void main() {
    writeln(GetDoubleClickTime());
}