made comparison operators constant expressions

Author: JoshuaWise

src/objects/statement/statement.h

@@ -17,7 +17,7 @@ class Statement : public Nan::ObjectWrap, public Query {
 		static void Init();
 
 		class Compare { public:
-			bool operator() (const Statement*, const Statement*);
+			bool operator() (const Statement*, const Statement*) const;
 		};
 		v8::Local<v8::Object> GetBindMap();
 

src/objects/statement/util.cc

@@ -1,5 +1,5 @@
 // Used by std::set to organize the pointers it holds.
-bool Statement::Compare::operator() (const Statement* a, const Statement* b) {
+bool Statement::Compare::operator() (const Statement* a, const Statement* b) const {
 	return a->id < b->id;
 }
 

src/objects/transaction/transaction.h

@@ -16,7 +16,7 @@ class Transaction : public Nan::ObjectWrap, public Query {
 		static void Init();
 
 		class Compare { public:
-			bool operator() (const Transaction*, const Transaction*);
+			bool operator() (const Transaction*, const Transaction*) const;
 		};
 		v8::Local<v8::Object> GetBindMap();
 

src/objects/transaction/util.cc

@@ -1,5 +1,5 @@
 // Used by std::set to organize the pointers it holds.
-bool Transaction::Compare::operator() (const Transaction* a, const Transaction* b) {
+bool Transaction::Compare::operator() (const Transaction* a, const Transaction* b) const {
 	return a->id < b->id;
 }