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add operator== implementation for lua proxy units

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Checks whether on-map, recall, and private ones are identical
Based on that units always have an underlying_id and that it's unique.
This commit is contained in:
Anonymissimus 2012-06-29 17:34:27 +00:00
parent 19354101ff
commit 9488f708a0
1 changed files with 15 additions and 1 deletions
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16
src/scripting/lua.cpp
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@ -941,6 +941,18 @@ static int impl_unit_collect(lua_State *L)
return 0;
}
/**
* Checks two lua proxy units for equality. (__eq metamethod)
*/
static int impl_unit_equality(lua_State* L)
{
unit* left = luaW_checkunit(L, 1);
unit* right = luaW_checkunit(L, 2);
const bool equal = left->underlying_id() == right->underlying_id();
lua_pushboolean(L, equal);
return 1;
}
/**
* Gets some data on a unit (__index metamethod).
* - Arg 1: full userdata containing the unit id.
@ -3595,9 +3607,11 @@ LuaKernel::LuaKernel(const config &cfg)
// Create the getunit metatable.
lua_pushlightuserdata(L
, static_cast<void *>(const_cast<char *>(&getunitKey)));
lua_createtable(L, 0, 4);
lua_createtable(L, 0, 5);
lua_pushcfunction(L, impl_unit_collect);
lua_setfield(L, -2, "__gc");
lua_pushcfunction(L, impl_unit_equality);
lua_setfield(L, -2, "__eq");
lua_pushcfunction(L, impl_unit_get);
lua_setfield(L, -2, "__index");
lua_pushcfunction(L, impl_unit_set);