Modernize lua read (part 1): C++ templating insurance (#7394)

* Modernize lua read (part 1): C++ templating assurance

Implement the float reader

1 files changed, 12 insertions, 0 deletions

diff --git a/src/script/lua_api/l_base.cpp b/src/script/lua_api/l_base.cpp
index e62aa2368..052f661bb 100644
--- a/src/script/lua_api/l_base.cpp
+++ b/src/script/lua_api/l_base.cpp
@@ -90,3 +90,15 @@ bool ModApiBase::isNaN(lua_State *L, int idx)
 {
 	return lua_type(L, idx) == LUA_TNUMBER && std::isnan(lua_tonumber(L, idx));
 }
+
+/*
+ * Read template functions
+ */
+template<>
+float ModApiBase::readParam(lua_State *L, int index)
+{
+	if (isNaN(L, index))
+		throw LuaError("NaN value is not allowed.");
+
+	return (float) luaL_checknumber(L, index);
+}