test lua intf, return pointer.

lua-intf-return-pointer.cpp

#include "LuaIntf/LuaIntf.h"
using namespace LuaIntf;

void* test_malloc(int n) {
    return malloc(n);
}

void test_free(void* p) {
    free(p);
}

void open(lua_State* L) {
    LuaBinding(L).beginModule("test")
        .addFunction("malloc", &test_malloc)
        .addFunction("free", &test_free)
        .endModule();
}

int main() {
    LuaContext ctx;
    open(ctx.state());

    ctx.doString("test.free(test.malloc(10))");
}

// $ clang++ -std=c++11 test.cpp -llua
// $ ./a.out
// libc++abi.dylib: terminating with uncaught exception of type LuaIntf::LuaException: [string "test.free(test.malloc(10))"]:1: bad argument #-1 to 'malloc' (table expected, got nil)
[1]    12892 abort      ./a.out

You could define a LuaTypeMapping<void *> class, and create a lua table that contains low and high part of void *(consider 64bit platforms) in the push method.