RE: Very small feature request

["Joshua Jensen" <jjensen@...>]

> >I believe that many C++ developers use lua these days. 
> Although the lua 
> >interpreter is written in C, it would be nice if the 3 main 
> headers had 
> >extern "C" declarations in them.
> 
> This is a frequent request. However, Lua's implementation 
> compiles under both C and C++. Adding extern "C" would force 
> it to be a C library instead of a C++ library. --lhf

I had to do it via macros.  There was an application we embedded Lua 5.0
in that had an old Lua 3.2 binding that couldn't be replaced.  I had to
do the following:

#ifdef LUA_CPP_MODE
#define NAMESPACE_LUA_BEGIN namespace Lua {
#define NAMESPACE_LUA_END } // namespace Lua
#define USING_NAMESPACE_LUA using namespace Lua;
#define NAMESPACE_LUA_PREFIX Lua::
#define LUA_EXTERN_C
#define LUA_EXTERN_C_BEGIN
#define LUA_EXTERN_C_END
#else
#define NAMESPACE_LUA_BEGIN
#define NAMESPACE_LUA_END
#define USING_NAMESPACE_LUA
#define NAMESPACE_LUA_PREFIX
#define LUA_EXTERN_C extern "C"
#define LUA_EXTERN_C_BEGIN extern "C" {
#define LUA_EXTERN_C_END }
#endif LUA_CPP_MODE

I wrapped every Lua source and header file with NAMESPACE_LUA_BEGIN and
NAMESPACE_LUA_END.  Then I used LUA_EXTERN_C* where appropriate.  It
worked great.  I'd highly recommend it.

Josh