Abstract IResult interface for Result

This is to allow faking the result for testing the CrudModel.

pgsql/Pgsql_ResultConstIterator.h

@@ -0,0 +1,51 @@
+#pragma once
+
+#include "Pgsql_Row.h"
+
+namespace Pgsql {
+
+    class IResult;
+
+    class ResultConstIterator {
+    public:
+        ResultConstIterator(const IResult &r, int rw)
+            : m_row(r, rw)
+        {}
+
+        ResultConstIterator operator++()
+        {
+            ResultConstIterator t(*this);
+            m_row.next();
+            return t;
+        }
+
+        ResultConstIterator& operator++(int)
+        {
+            m_row.next();
+            return *this;
+        }
+
+        bool operator==(const ResultConstIterator &rhs)
+        {
+            return m_row == rhs.m_row;
+        }
+
+        bool operator!=(const ResultConstIterator &rhs)
+        {
+            return !operator==(rhs);
+        }
+
+        const Row& operator*()
+        {
+            return m_row;
+        }
+        const Row& operator->()
+        {
+            return m_row;
+        }
+
+    private:
+        Row m_row;
+    };
+
+}