Improve ranges::find to support projection.

src/include/util.h

@@ -165,6 +165,17 @@ fs::path GetExecutablePath();
 /*----------------------------------------------------------------------------
 --  Ranges
 ----------------------------------------------------------------------------*/
+#include <functional>
+
+struct identity
+{
+	template <typename T>
+	T &&operator()(T &&arg) const
+	{
+		return std::forward<T>(arg);
+	}
+};
+
 namespace ranges
 {
 
@@ -180,10 +191,11 @@ namespace ranges
 		std::iota(begin(range), end(range), startValue);
 	}
 
-	template<typename Range, typename Value>
-	auto find(Range& range, const Value& value)
+	template<typename Range, typename Value, typename Proj = identity>
+	auto find(Range& range, const Value& value, Proj proj = {})
 	{
-		return std::find(begin(range), end(range), value);
+		return std::find_if(
+			begin(range), end(range), [&](const auto &elem) { return std::invoke(proj, elem) == value; });
 	}
 
 	template <typename Range, typename Predicate>

src/spell/script_spell.cpp

@@ -307,8 +307,7 @@ static int CclDefineSpell(lua_State *l)
 	const int args = lua_gettop(l);
 	std::string_view identname = LuaToString(l, 1);
 
-	const auto it = ranges::find_if(SpellTypeTable,
-	                          [&](const SpellType *spell) { return spell->Ident == identname; });
+	const auto it = ranges::find(SpellTypeTable, identname, &SpellType::Ident);
 	SpellType *spell = nullptr;
 	if (it != SpellTypeTable.end()) {
 		spell = *it;

src/spell/spells.cpp

@@ -416,7 +416,7 @@ void InitSpells()
 */
 SpellType &SpellTypeByIdent(const std::string_view &ident)
 {
-	auto it = ranges::find_if(SpellTypeTable, [&](const SpellType* spell) { return spell->Ident == ident; });
+	auto it = ranges::find(SpellTypeTable, ident, &SpellType::Ident);
 	if (it != SpellTypeTable.end()) {
 		return **it;
 	}

src/ui/ui.cpp

@@ -188,8 +188,7 @@ CUserInterface::CUserInterface() :
 */
 CPopup &PopupByIdent(std::string_view ident)
 {
-	const auto it =
-		ranges::find_if(UI.ButtonPopups, [&](CPopup *popup) { return popup->Ident == ident; });
+	const auto it = ranges::find(UI.ButtonPopups, ident, &CPopup::Ident);
 	if (it != UI.ButtonPopups.end()) {
 		return **it;
 	}