diff --git a/.gitignore b/.gitignore
index 4469528..8826a2f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 **/build
+**/.cache
diff --git a/instrument/CMakeLists.txt b/instrument/CMakeLists.txt
new file mode 100644
index 0000000..3001a0b
--- /dev/null
+++ b/instrument/CMakeLists.txt
@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.5)
+project(interceptor)
+
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_subdirectory(target)
+add_subdirectory(instrument)
+add_subdirectory(app)
diff --git a/instrument/app/CMakeLists.txt b/instrument/app/CMakeLists.txt
new file mode 100644
index 0000000..cdb5065
--- /dev/null
+++ b/instrument/app/CMakeLists.txt
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.5)
+project(app)
+
+file(GLOB SOURCES "src/*.cpp")
+add_executable(${PROJECT_NAME} ${SOURCES})
+target_link_libraries(${PROJECT_NAME} PRIVATE target)
diff --git a/instrument/app/src/main.cpp b/instrument/app/src/main.cpp
new file mode 100644
index 0000000..7d04d52
--- /dev/null
+++ b/instrument/app/src/main.cpp
@@ -0,0 +1,7 @@
+#include "A.h"
+
+int main(int argc, const char *argp[], const char *envp[]) {
+	A a;
+	a.method("test");
+	return 0;
+}
diff --git a/instrument/compile_commands.json b/instrument/compile_commands.json
new file mode 120000
index 0000000..25eb4b2
--- /dev/null
+++ b/instrument/compile_commands.json
@@ -0,0 +1 @@
+build/compile_commands.json
\ No newline at end of file
diff --git a/instrument/instrument/CMakeLists.txt b/instrument/instrument/CMakeLists.txt
new file mode 100644
index 0000000..a003663
--- /dev/null
+++ b/instrument/instrument/CMakeLists.txt
@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 3.5)
+project(instrument)
+
+file(GLOB SOURCES "src/*.cpp")
+add_library(${PROJECT_NAME} SHARED ${SOURCES})
+add_dependencies(${PROJECT_NAME} target)
+target_link_libraries(${PROJECT_NAME} 
+	PRIVATE 
+	dl
+)
diff --git a/instrument/instrument/src/intercept.cpp b/instrument/instrument/src/intercept.cpp
new file mode 100644
index 0000000..bcd2833
--- /dev/null
+++ b/instrument/instrument/src/intercept.cpp
@@ -0,0 +1,31 @@
+#include <dlfcn.h>
+#include <string>
+#include <iostream>
+using std::cout;
+using std::endl;
+
+class A;
+
+// Function pointer to store the original method
+typedef void (*MethodType)(A *, const std::string &);
+MethodType original_method = nullptr;
+
+extern "C" void _ZN1A6methodERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE(A *obj, const std::string &msg) {
+    cout << "Intercepted A::method with message: " << msg << endl;
+
+    // Call the original method if it was found
+    if (original_method) {
+        original_method(obj, msg);
+    }
+}
+
+// Initialization function
+extern "C" void __attribute__((constructor)) init() {
+    cout << "Shared library has been preloaded." << endl;
+
+    // Get the original A::method using dlsym and RTLD_NEXT
+    original_method = (MethodType)dlsym(RTLD_NEXT, "_ZN1A6methodERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE");
+    if (!original_method) {
+        cout << "Error: unable to find original A::method" << endl;
+    }
+}
diff --git a/instrument/target/CMakeLists.txt b/instrument/target/CMakeLists.txt
new file mode 100644
index 0000000..acc5f5e
--- /dev/null
+++ b/instrument/target/CMakeLists.txt
@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.5)
+project(target)
+
+file(GLOB SOURCES "src/*.cpp")
+add_library(${PROJECT_NAME} SHARED ${SOURCES})
+target_include_directories(${PROJECT_NAME} 
+	PUBLIC
+	include)
diff --git a/instrument/target/include/A.h b/instrument/target/include/A.h
new file mode 100644
index 0000000..73d6c0b
--- /dev/null
+++ b/instrument/target/include/A.h
@@ -0,0 +1,7 @@
+#pragma once
+#include <string>
+
+class A {
+public:
+    void method(const std::string& msg);
+};
diff --git a/instrument/target/src/A.cpp b/instrument/target/src/A.cpp
new file mode 100644
index 0000000..26d2b7d
--- /dev/null
+++ b/instrument/target/src/A.cpp
@@ -0,0 +1,8 @@
+#include "A.h"
+#include <iostream>
+using std::cout;
+using std::endl;
+
+void A::method(const std::string &msg) {
+	cout << "original: " << msg << endl;
+}