src/function.cpp

   1 // Copyright (c) 2003 Daniel Wallin and Arvid Norberg
   2
   3 // Permission is hereby granted, free of charge, to any person obtaining a
   4 // copy of this software and associated documentation files (the "Software"),
   5 // to deal in the Software without restriction, including without limitation
   6 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
   7 // and/or sell copies of the Software, and to permit persons to whom the
   8 // Software is furnished to do so, subject to the following conditions:
   9
  10 // The above copyright notice and this permission notice shall be included
  11 // in all copies or substantial portions of the Software.
  12
  13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
  14 // ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
  15 // TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
  16 // PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
  17 // SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
  18 // ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  19 // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
  21 // OR OTHER DEALINGS IN THE SOFTWARE.
  22
  23 #include <luabind/lua_include.hpp>
  24
  25 #include <luabind/config.hpp>
  26 #include <luabind/luabind.hpp>
  27
  28 int luabind::detail::free_functions::function_dispatcher(lua_State* L)
  29 {
  30         function_rep* rep = static_cast<function_rep*>(lua_touserdata(L, lua_upvalueindex(1)));
  31
  32         std::size_t converter_storage[LUABIND_MAX_ARITY];
  33
  34         bool ambiguous = false;
  35         int min_match = std::numeric_limits<int>::max();
  36         int match_index = -1;
  37         bool ret;
  38
  39 #ifdef LUABIND_NO_ERROR_CHECKING
  40
  41         if (rep->overloads().size() == 1)
  42         {
  43                 match_index = 0;
  44         }
  45         else
  46         {
  47
  48 #endif
  49                 int num_params = lua_gettop(L);
  50                 ret = find_best_match(L, &rep->overloads().front(), rep->overloads().size(), sizeof(free_functions::overload_rep), ambiguous, min_match, match_index, num_params);
  51
  52 #ifdef LUABIND_NO_ERROR_CHECKING
  53         }
  54
  55 #else
  56
  57         if (!ret)
  58         {
  59                 // this bock is needed to make sure the std::string is destructed
  60                 {
  61                         std::string msg = "no match for function call '";
  62                         msg += rep->name();
  63                         msg += "' with the parameters (";
  64                         msg += stack_content_by_name(L, 1);
  65                         msg += ")\ncandidates are:\n";
  66
  67                         msg += get_overload_signatures(L, rep->overloads().begin(), rep->overloads().end(), rep->name());
  68
  69                         lua_pushstring(L, msg.c_str());
  70                 }
  71
  72                 lua_error(L);
  73         }
  74
  75         if (ambiguous)
  76         {
  77                 // this bock is needed to make sure the std::string is destructed
  78                 {
  79                         std::string msg = "call of overloaded function '";
  80                         msg += rep->name();
  81                         msg += "(";
  82                         msg += stack_content_by_name(L, 1);
  83                         msg += ") is ambiguous\nnone of the overloads have a best conversion:";
  84
  85                         std::vector<const overload_rep_base*> candidates;
  86                         find_exact_match(L, &rep->overloads().front(), rep->overloads().size(), sizeof(free_functions::overload_rep), min_match, num_params, candidates);
  87
  88                         msg += get_overload_signatures_candidates(L, candidates.begin(), candidates.end(), rep->name());
  89
  90                         lua_pushstring(L, msg.c_str());
  91                 }
  92                 lua_error(L);
  93         }
  94 #endif
  95         const overload_rep& ov_rep = rep->overloads()[match_index];
  96         return ov_rep.call(L, ov_rep.fun, converter_storage);
  97 }
  98