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      1 // Copyright 2011 Google Inc.
      2 // All rights reserved.
      3 //
      4 // Redistribution and use in source and binary forms, with or without
      5 // modification, are permitted provided that the following conditions are
      6 // met:
      7 //
      8 // * Redistributions of source code must retain the above copyright
      9 //   notice, this list of conditions and the following disclaimer.
     10 // * Redistributions in binary form must reproduce the above copyright
     11 //   notice, this list of conditions and the following disclaimer in the
     12 //   documentation and/or other materials provided with the distribution.
     13 // * Neither the name of Google Inc. nor the names of its contributors
     14 //   may be used to endorse or promote products derived from this software
     15 //   without specific prior written permission.
     16 //
     17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     18 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     19 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     20 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     21 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     22 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     27 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28 
     29 #if !defined(LUTOK_STATE_IPP)
     30 #define LUTOK_STATE_IPP
     31 
     32 #include <lutok/state.hpp>
     33 
     34 namespace lutok {
     35 
     36 
     37 /// Wrapper around lua_newuserdata.
     38 ///
     39 /// This allocates an object as big as the size of the provided Type.
     40 ///
     41 /// \return The pointer to the allocated userdata object.
     42 ///
     43 /// \warning Terminates execution if there is not enough memory.
     44 template< typename Type >
     45 Type*
     46 state::new_userdata(void)
     47 {
     48     return static_cast< Type* >(new_userdata_voidp(sizeof(Type)));
     49 }
     50 
     51 
     52 /// Wrapper around lua_touserdata.
     53 ///
     54 /// \param index The second parameter to lua_touserdata.
     55 ///
     56 /// \return The return value of lua_touserdata.
     57 template< typename Type >
     58 Type*
     59 state::to_userdata(const int index)
     60 {
     61     return static_cast< Type* >(to_userdata_voidp(index));
     62 }
     63 
     64 
     65 }  // namespace lutok
     66 
     67 #endif  // !defined(LUTOK_STATE_IPP)
     68