Avoid use of std::function where possible

Author: AlexPeshkoff

src/common/classes/array.h

@@ -482,7 +482,8 @@ class Array : public Storage
 		return false;
 	}
 
-	bool find(const std::function<int(const T& item)>& compare, size_type& pos) const
+	template <typename F>
+	bool findEx(F&& compare, size_type& pos) const
 	{
 		for (size_type i = 0; i < count; i++)
 		{

src/jrd/Resources.h

@@ -249,7 +249,7 @@ class Resources final
 
 		bool checkPresence(StoredElement* res, FB_SIZE_T& pos)
 		{
-			return this->find([res](const CachedResource<OBJ, PERM>& elem) {
+			return this->findEx([res](const CachedResource<OBJ, PERM>& elem) {
 					auto* e = elem();
 					return e == res ? 0 : std::less<StoredElement*>{}(e, res) ? -1 : 1;
 				}, pos);

src/jrd/intl.cpp

@@ -271,7 +271,7 @@ Collation* CharSetVers::getCollation(CollId id)
 Collation* CharSetVers::getCollation(const QualifiedName& name)
 {
 	FB_SIZE_T pos;
-	if (charset_collations.find([name](Collation* col) { return col->name == name; }, pos))
+	if (charset_collations.findEx([name](Collation* col) { return col->name == name; }, pos))
 		return charset_collations[pos]->validate();
 
 	ERR_post(Arg::Gds(isc_text_subtype) << name.toQuotedString());