update

Author: XiaochenCui

play/CMakeLists.txt

@@ -10,4 +10,26 @@ add_executable(server
 target_link_libraries(server
     PRIVATE
     absl::status
+    lib_a
+    lib_b
+)
+
+add_library(lib_a
+    lib_a.h
+    lib_a.cc
+)
+
+target_link_libraries(lib_a
+    PRIVATE
+    lib_b
+)
+
+add_library(lib_b
+    lib_b.h
+    lib_b.cc
+)
+
+target_link_libraries(lib_b
+    PRIVATE
+    lib_a
 )

play/lib_a.cc

@@ -0,0 +1,17 @@
+
+#pragma once
+
+#include <iostream>
+
+#include "lib_b.h"
+
+namespace lib_a {
+    void lib_a_function() {
+        std::cout << "lib_a_function called" << std::endl;
+        lib_b::lib_b_self();
+    }
+
+    void lib_a_self() {
+        std::cout << "lib_a_self called" << std::endl;
+    }
+}

play/lib_a.h

@@ -0,0 +1,8 @@
+#include <iostream>
+
+namespace lib_a {
+    void lib_a_function() {
+        // This function is intentionally left empty.
+        std::cout << "lib_a_function called" << std::endl;
+    }
+}

play/lib_b.cc

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <iostream>
+
+#include "lib_a.h"
+
+namespace lib_b {
+    void lib_b_function() {
+        std::cout << "lib_b_function called" << std::endl;
+        lib_a::lib_a_self();
+    }
+
+    void lib_b_self() {
+        std::cout << "lib_b_self called" << std::endl;
+    }
+}

play/lib_b.h

@@ -1,6 +1,9 @@
 #include "absl/status/status.h"
 #include <iostream>
 
+#include "lib_a.h"
+#include "lib_b.h"
+
 int main() {
     absl::Status status = absl::InternalError("Something went wrong!");
     if (!status.ok()) std::cerr << "Error: " << status.message() << std::endl;