[oolua] Issue #8: Exporting Member variable with self-defined type fails, while basic-type (liamdevine/oolua)
- From: "Oscar Zhao" <issues-reply@xxxxxxxxxxxxx>
- To: oolua@xxxxxxxxxxxxx
- Date: Fri, 26 Sep 2014 02:29:26 -0000
New issue 8: Exporting Member variable with self-defined type fails, while
basic-type
https://bitbucket.org/liamdevine/oolua/issue/8/exporting-member-variable-with-self
Oscar Zhao:
This is a more precise description of issue #7. I succeeded export member
variables with basic types( int, double, string, etc.) but failed to export
self-defined types ( self-defined classes). The error from visual studio 2008
is a compile error. Here I try my best to state my question clearly, hoping to
get some help, thanks. The test code is as following:
```
#!c++
#include "oolua.h"
#include "oolua_dsl.h"
#include "oolua_dsl_export.h"
#include <iostream>
/**
* export self-defined type
*/
struct Mouse
{
public:
Mouse():m_strColor("black"), m_strBrand("Dell") {}
std::string m_strColor;
std::string m_strBrand;
};
struct Computer{
public:
double m_dLengthMeter;
double m_dWidthMeter;
double m_dHeightMeter;
std::string m_strBrand;
std::string m_strModel;
std::string m_strSerialNumber;
std::string m_strDateProduced;
// self-defined type member variable
Mouse m_mouse;
Computer():m_dLengthMeter(0.5), m_dWidthMeter(0.3), m_dHeightMeter(0.3)
, m_strBrand("Acer"), m_strModel("4741g"), m_strSerialNumber("100001")
, m_strDateProduced("2014-09-23")
{}
bool isWorking(){return true;}
bool isDell(){return true;}
bool isLenovo(){return true;}
bool isApple(){return true;}
bool isAcer(){return true;}
bool func0(){return true;}
bool func1(){return true;}
bool func2(){return true;}
bool func3(){return true;}
};
// Proxy
OOLUA_PROXY(Mouse)
OOLUA_PROXY_END
OOLUA_PROXY(Computer)
OOLUA_MGET_MSET(m_dLengthMeter) // works
OOLUA_MGET_MSET(m_dWidthMeter) // works
OOLUA_MGET_MSET(m_dHeightMeter) // works
OOLUA_MGET_MSET(m_strBrand) // works
OOLUA_MGET_MSET(m_strModel) // works
// compile error, "error C2440: 'static_cast' : cannot convert from
'lua_Integer' to 'Mouse'"
OOLUA_MGET_MSET(m_mouse)
OOLUA_MFUNC(isWorking)
OOLUA_MFUNC(isDell)
OOLUA_MFUNC(isAcer)
OOLUA_MFUNC(isApple)
OOLUA_MFUNC(isLenovo)
OOLUA_MFUNC(func0)
OOLUA_MFUNC(func1)
OOLUA_MFUNC(func2)
OOLUA_MFUNC(func3)
OOLUA_PROXY_END
// Export
OOLUA_EXPORT_NO_FUNCTIONS(Mouse)
OOLUA_EXPORT_FUNCTIONS(Computer
, isWorking, isDell, isAcer, isApple, isLenovo
, set_m_dLengthMeter, set_m_dWidthMeter,
set_m_dHeightMeter
, set_m_strBrand, set_m_strModel
, set_m_mouse // export setter
, func0, func1, func2, func3
)
OOLUA_EXPORT_FUNCTIONS_CONST(Computer
, get_m_dLengthMeter, get_m_dWidthMeter,
get_m_dHeightMeter
, get_m_strBrand, get_m_strModel
, get_m_mouse // export getter
)
int main()
{
OOLUA::Script* vm = new OOLUA::Script;
vm->register_class<Computer>();
/**
* code to use class Computer in lua
*/
vm->run_chunk(
"function func() "
"com = Computer.new() "
"com:set_m_strBrand(\"Dell\") "
"w = com:get_m_strBrand() "
"return w "
"end ");
vm->call("func");
std::string brand;
OOLUA::pull(*vm, brand);
std::cout << "Brand: " << brand << std::endl;
system("pause");
delete(vm);
return 0;
}
```
The error message is:
```
#!lua
1>------ Build started: Project: TestProxy, Configuration: Debug Win32 ------
1>Compiling...
1>main.cpp
1>e:\work\libs\trunk\include\oolua\stack_get.h(121) : error C2440:
'static_cast' : cannot convert from 'lua_Integer' to 'Mouse'
1> No constructor could take the source type, or constructor overload
resolution was ambiguous
1> e:\work\libs\trunk\include\oolua\stack_get.h(117) : while compiling
class template member function 'void
OOLUA::INTERNAL::LUA_CALLED::get_basic_type<T,is_integral,is_convertable_to_int>::get(lua_State
*const ,int,T &)'
1> with
1> [
1> T=Mouse,
1> is_integral=1,
1> is_convertable_to_int=1
1> ]
1> e:\work\libs\trunk\include\oolua\stack_get.h(136) : see reference to
class template instantiation
'OOLUA::INTERNAL::LUA_CALLED::get_basic_type<T,is_integral,is_convertable_to_int>'
being compiled
1> with
1> [
1> T=Mouse,
1> is_integral=1,
1> is_convertable_to_int=1
1> ]
1> e:\work\libs\trunk\include\oolua\stack_get.h(134) : while compiling
class template member function 'void
OOLUA::INTERNAL::LUA_CALLED::get_basic_type<T,is_integral,is_convertable_to_int>::get_imp(lua_State
*const ,int,T &,LVD::Int2type<0>)'
1> with
1> [
1> T=Mouse,
1> is_integral=0,
1> is_convertable_to_int=0
1> ]
1> e:\work\libs\trunk\include\oolua\stack_get.h(210) : see reference to
class template instantiation
'OOLUA::INTERNAL::LUA_CALLED::get_basic_type<T,is_integral,is_convertable_to_int>'
being compiled
1> with
1> [
1> T=Mouse,
1> is_integral=0,
1> is_convertable_to_int=0
1> ]
1> e:\work\git\oolua\ooluatest\src\testproxy\main.cpp(64) : see
reference to function template instantiation 'void
OOLUA::INTERNAL::LUA_CALLED::get<Mouse>(lua_State *const ,int,T &)' being
compiled
1> with
1> [
1> T=Mouse
1> ]
1>Build log was saved at
"file://E:\work\Git\OOLua\OOLuaTest\_builder\Debug\TestProxy\BuildLog.htm"
1>TestProxy - 1 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
```
Responsible: liamdevine
Other related posts:
- » [oolua] Issue #8: Exporting Member variable with self-defined type fails, while basic-type (liamdevine/oolua) - Oscar Zhao
