So basically I get the error "function button(lua_State* L) is not callable using argument types ()" whenever I try to lua_register a function.
```
lua_register(L,"button",button);
```
but whenever I use the function pointer I get the error "lua_register is not callable using argument types (lua_State*, char*,extern (C) int function(lua_State* L)"
```
lua_register(L,"button",&button);
```

Is this a bug, or am I doing something wrong here?

On Tuesday, 2 August 2016 at 14:23:55 UTC, Jack wrote:
> So basically I get the error "function button(lua_State* L) is not callable using argument types ()" whenever I try to lua_register a function.
> ```
> lua_register(L,"button",button);
> ```
> but whenever I use the function pointer I get the error "lua_register is not callable using argument types (lua_State*, char*,extern (C) int function(lua_State* L)"
> ```
> lua_register(L,"button",&button);
> ```
>
> Is this a bug, or am I doing something wrong here?

lua_register takes function pointers that in the form of lua_CFunction, an alias you can find declared in derelict.lua.types [1]. As you'll see there, it is declared to be both extern(C) and nothrow. Make your button function nothrow an you should be good to go.

[1] https://github.com/DerelictOrg/DerelictLua/blob/master/source/derelict/lua/types.d#L103

On Tuesday, 2 August 2016 at 16:44:39 UTC, Mike Parker wrote:
> On Tuesday, 2 August 2016 at 14:23:55 UTC, Jack wrote:
>> [...]
>
> lua_register takes function pointers that in the form of lua_CFunction, an alias you can find declared in derelict.lua.types [1]. As you'll see there, it is declared to be both extern(C) and nothrow. Make your button function nothrow an you should be good to go.
>
> [1] https://github.com/DerelictOrg/DerelictLua/blob/master/source/derelict/lua/types.d#L103

Thank you!