Add example static lib + unit tests

Author: ramsafin

CMakeLists.txt

@@ -19,13 +19,16 @@ endif()
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake")
 include(Sanitizers)
 
+# === Libraries ===
+add_subdirectory(src)
+
 # === Application target ===
 add_executable(${PROJECT_NAME}
   src/main.cpp
 )
 
-target_include_directories(${PROJECT_NAME}
-  PRIVATE ${PROJECT_SOURCE_DIR}/include
+target_link_libraries(${PROJECT_NAME}
+  PRIVATE arithmetic
 )
 
 if(TARGET sanitizers)

include/.gitkeep

@@ -0,0 +1,12 @@
+#ifndef MATH_ARITHMETIC_HPP
+#define MATH_ARITHMETIC_HPP
+
+namespace math
+{
+
+int add(int a, int b);
+int subtract(int a, int b);
+
+}  // namespace math
+
+#endif

include/math/arithmetic.hpp

@@ -0,0 +1,11 @@
+add_library(arithmetic STATIC
+  arithmetic.cpp
+)
+
+target_include_directories(arithmetic
+  PUBLIC ${PROJECT_SOURCE_DIR}/include
+)
+
+if(TARGET sanitizers)
+  target_link_libraries(arithmetic PUBLIC sanitizers)
+endif()

src/CMakeLists.txt

@@ -0,0 +1,16 @@
+#include "math/arithmetic.hpp"
+
+namespace math
+{
+
+int add(int a, int b)
+{
+  return a + b;
+}
+
+int subtract(int a, int b)
+{
+  return a - b;
+}
+
+}  // namespace math

src/arithmetic.cpp

@@ -1,7 +1,13 @@
-#include <iostream>  // cout
+#include <iostream>
+#include "math/arithmetic.hpp"
 
 int main()
 {
-  std::cout << "Modern C++ project template.\n";
+  const int a = 10;
+  const int b = 4;
+
+  std::cout << "Add: " << math::add(a, b) << '\n';
+  std::cout << "Subtract: " << math::subtract(a, b) << '\n';
+
   return 0;
 }

src/main.cpp

@@ -15,15 +15,11 @@ FetchContent_MakeAvailable(googletest)
 # === Unit Test Target ===
 add_executable(unit_tests
   test_main.cpp
-  test_core.cpp
+  test_arithmetic.cpp
 )
 
 target_link_libraries(unit_tests
-  PRIVATE gtest_main
-)
-
-target_include_directories(unit_tests
-  PRIVATE ${PROJECT_SOURCE_DIR}/include
+  PRIVATE gtest_main arithmetic
 )
 
 if(TARGET sanitizers)

tests/CMakeLists.txt

@@ -0,0 +1,12 @@
+#include <gtest/gtest.h>
+#include "math/arithmetic.hpp"
+
+TEST(Arithmetic, Add)
+{
+  EXPECT_EQ(math::add(2, 3), 5);
+}
+
+TEST(Arithmetic, Subtract)
+{
+  EXPECT_EQ(math::subtract(10, 3), 7);
+}