Re: std::string vs other strings

I'm not sure if it's needed, but I also copied the converter for a
const string by value parameter. For your code, it would look
something like:

template <>

struct default_converter<String const>

: default_converter<String>

{};

Cory

On 11/13/2012 11:27 AM, Roman Kubiak
wrote:

My converter is
pretty simple:

namespace luabind

{

template
<> struct default_converter<String> :
native_converter_base<String>

{

static
int compute_score(lua_State* L, int index)

{

_DBG("default_converter<String>::compute_score
got userdata");

return
(lua_type(L, index) == LUA_TSTRING) ? 0 : -1;

}

String
from(lua_State* L, int index)

{

_DBG("default_converter<String>::from
from");

return
String(lua_tostring(L, index));

}

void
to(lua_State* L, String const &value)

{

_DBG("default_converter<String>::from
to");

lua_pushlstring(L,
value.toUTF8(), value.length());

}

};

template
<> struct default_converter<String const&>
: default_converter<String>

{

};

}

When i do in lua:

console("helo")

i get this output:

(25757538)
default_converter<String>::compute_score got
userdata

(25757539.7) default_converter<String>::from from

helo

When i do:

str = String("helo")

console(str)

i get this:

(25807812.1)
default_converter<String>::compute_score got
userdata

ERROR: No matching overload found, candidates:

void console(String const&)

====================================================================

_
_ _ _ _ _
__ _____| | |_
__ _ __ _ ___ __ ___ _ _| |_ _ _ ___| | |___ __| |
\ V / _ \ |
_/ _` / _` / -_) / _/ _ \ ' \ _| '_/ _ \ | / -_) _` |
\_/\___/_|\__\__,_\__,
\___| \__\___/_||_\__|_| \___/_|_\___\__,_|

|___/

====================================================================

On Tue, Nov 13, 2012 at 5:42 AM, Cory
Riddell <[email protected] >
wrote:

I don't have your
String class, so I tried the same thing you describing
using MFC CStrings.

In my C++ code, I defined the following:

void console(const CString &textToPrint)

{

// write output to a debug window and echo it to a log
file

printToOutput(std::string(textToPrint));

}

CString getName()

{

return CString("my name");

}

I bound them:

luabind::module(myLuaState) [

luabind::def("console", console),

luabind::def("getName", getName)

];

Then called them in a lua script:

console(getName())

Everything seemed to work just fine. The string "my name"
is written to my debug window and echoed to my log file by
my printToOutput function.

Maybe post your converter definitions and how you are
binding to lua.

Cory

On 11/12/2012 12:59 PM, Roman Kubiak wrote:

I
got back to the problem and tried again with the
conversion, i noticed that it matters when the
converter is defined in the include files, so now
i get the converter working, but too much.

i have a
simple method that prints a string to the
console defined as

void console
(const String &textToPrint);

and i have
loads of methods/functions that return a
String() object for example:

String getName() { return
(String("my name")); }

now when the converter is
registered i can't do

console
(getName())

this causes
an error saying there are no valid candidates
for the console call, i noticed that the
converter is

using the
compute_score() to determine if a String()
object is a string (lua_type(L, index) ==
LUA_TSTRING) and i'ts not

it's
LUA_TUSERDATA, now if i return 1 in
compute_score() the function from() will be
called but it will have the

String()
object on the stack, and i can't convert it
using luabind::object() since it's
object_cast<>() methos will

call the
converter again, and it will loop forever.

What's the
solution to this ?

====================================================================

_ _ _ _
_ _
__
_____| | |_ __ _ __ _ ___ __ ___ _ _| |_ _ _
___| | |___ __| |
\
V / _ \ | _/ _` / _` / -_) / _/ _ \ ' \ _|
'_/ _ \ | / -_) _` |
\_/\___/_|\__\__,_\__,

\___| \__\___/_||_\__|_| \___/_|_\___\__,_|

|___/

====================================================================

On Mon, Nov 12, 2012 at
4:47 PM, Cory Riddell <[email protected] >
wrote:

Thank you for the
pointer. It ended up being incredibly simple.
Here's

my code for CString:

namespace luabind

{

template <>

struct default_converter<CString>

: native_converter_base<CString>

{

static int compute_score(lua_State* L,
int index)

{

return lua_type(L, index) ==
LUA_TSTRING ? 0 : -1;

}

CString from(lua_State* L, int index)

{

return CString(lua_tostring(L,
index), lua_rawlen(L, index));

}

void to(lua_State* L, CString
const& value)

{

lua_pushlstring(L, (LPCTSTR)value,
value.GetLength());

}

};

template <>

struct default_converter<CString
const>

: default_converter<CString>

{};

template <>

struct default_converter<CString
const&>

: default_converter<CString>

{};

}

The only possible problem that I can see here
is needing to convert from

wchar_t to char (utf-8) when making a unicode
build.

Cory

On 11/9/2012 3:35 PM, Willi Schinmeyer
wrote:

> The std::string converter seems to be
defined in detail/policy.hpp:756

> as a specialization of
default_converter. I'd start my
investigation there.

>

>
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