Improved

Author: sajith

CMakeLists.txt

@@ -18,4 +18,5 @@ set(CMAKE_CXX_STANDARD 20)
 #add_executable(ocp OCP/ocp_using_runtime_concet.cpp)
 #add_executable(lsp LSP/lsp_classic_example.cpp)
 #add_executable(lsp LSP/lsp_better_example.cpp)
-add_executable(lspcovarient LSP/lsp_covariance_example.cpp)
+#add_executable(lspcovarient LSP/lsp_covariance_example.cpp)
+add_executable(lspqueryset LSP/lsp_query_set.cpp)

LSP/lsp_query_set.cpp

@@ -0,0 +1,38 @@
+//
+// Created by sajith on 4/17/21.
+//
+
+#include <iostream>
+#include <vector>
+
+
+template<typename Model>
+class ORMQueryset
+{
+public:
+    virtual ~ORMQueryset() = default;
+    virtual ORMQueryset &filterObjects(std::string, std::string) const = 0;
+    virtual ORMQueryset &orderObjects(std::string, std::string) const = 0;
+    virtual std::vector<Model> getObjects() const = 0;
+    virtual unsigned updateObjects() = 0;
+    virtual unsigned deleteObjects() = 0;
+};
+
+
+template<typename Model>
+class Database1ORMQueryset : public ORMQueryset<Model>
+{
+public:
+    ORMQueryset<Model> &filterObjects(std::string, std::string) const override;
+
+    ORMQueryset<Model> &orderObjects(std::string, std::string) const override;
+
+    std::vector<Model> getObjects() const override;
+
+    unsigned updateObjects() override;
+
+    unsigned deleteObjects() override;
+};
+
+
+