On Friday, 22 September 2017 at 02:22:46 UTC, Josh wrote:
src\mixer.d(80,22): Error: function pointer Mix_ChannelFinished
(extern (C) void function(int channel)) is not callable using
argument types (extern (C) void delegate(int channel))
Code:
void unmuteAfterPlaySound()
{
Mix_ChannelFinished(&channelDone);
}
extern (C) void channelDone(int channel)
{
unmuteMusic();
}
The error message indicates that `channelDone` is a member of a
class or a struct. A pointer to a member function is a delegate
(or closure), not a function pointer. Free functions, static
nested functions, and static member functions all produce
function pointer. Non-static member functions and non-static
nested functions all produce delegates/closures. See the docs:
https://dlang.org/spec/function.html#closures
If you need to manipulate instance members from a C callback,
you'll need a way to implement a mechanism to work out which
instance you need.
