• Jack (13/13) Aug 02 2016 So basically I get the error "function button(lua_State* L) is
• Mike Parker (8/21) Aug 02 2016 lua_register takes function pointers that in the form of
• Jack (2/11) Aug 02 2016 Thank you!

Jack <Jackoz530 gmail.com> writes:

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?

Mike Parker <aldacron gmail.com> writes:

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

Jack <Jackoz530 gmail.com> writes:

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!