Library Example Modules

Author: Behemyth

examples/conan_cmake/library/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.30)
+cmake_minimum_required(VERSION 4.0)
 
 project(mathutils
     VERSION 1.0.0
@@ -12,26 +12,23 @@ include(CMakePackageConfigHelpers)
 # Dependencies
 find_package(fmt REQUIRED)
 
-# Library target
-add_library(mathutils src/mathutils.cpp)
+# Library target with module support
+add_library(mathutils)
 add_library(mathutils::mathutils ALIAS mathutils)
 
-target_compile_features(mathutils PUBLIC cxx_std_17)
-target_include_directories(mathutils PUBLIC
-    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
-    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+target_sources(mathutils
+    PUBLIC
+    FILE_SET CXX_MODULES FILES
+    src/mathutils.ixx
 )
+
+target_compile_features(mathutils PUBLIC cxx_std_23)
 target_link_libraries(mathutils PUBLIC fmt::fmt)
 
 # Installation
 install(TARGETS mathutils
     EXPORT mathutilsTargets
-    INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
-)
-
-install(DIRECTORY include/
-    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
-    FILES_MATCHING PATTERN "*.h*"
+    FILE_SET CXX_MODULES DESTINATION ${CMAKE_INSTALL_LIBDIR}/cxx/miu
 )
 
 install(EXPORT mathutilsTargets

examples/conan_cmake/library/conanfile.py

@@ -0,0 +1,21 @@
+from conan import ConanFile
+from conan.tools.cmake import CMakeDeps, CMakeToolchain
+
+
+class MathUtilsConan(ConanFile):
+    name = 'mathutils'
+    version = '1.0.0'
+
+    settings = 'os', 'compiler', 'build_type', 'arch'
+
+    def configure(self):
+        # Enable fmt module support
+        self.options['fmt'].with_modules = True
+
+    def generate(self):
+        deps = CMakeDeps(self)
+        deps.generate()
+
+        tc = CMakeToolchain(self)
+        tc.variables['FMT_MODULE'] = True
+        tc.generate()

examples/conan_cmake/library/src/mathutils.cpp

@@ -1,6 +1,8 @@
-#pragma once
+export module mathutils;
 
-namespace mathutils
+import fmt;
+
+export namespace mathutils
 {
     /**
      * Add two numbers and return the result with formatted output
@@ -27,3 +29,28 @@ namespace mathutils
      */
     void print_result(const char *operation, double a, double b, double result);
 }
+
+// Implementation
+namespace mathutils
+{
+    double add(double a, double b)
+    {
+        double result = a + b;
+        print_result("addition", a, b, result);
+        return result;
+    }
+
+    double multiply(double a, double b)
+    {
+        double result = a * b;
+        print_result("multiplication", a, b, result);
+        return result;
+    }
+
+    void print_result(const char *operation, double a, double b, double result)
+    {
+        fmt::print(fg(fmt::terminal_color::green),
+                   "MathUtils {}: {} + {} = {}\n",
+                   operation, a, b, result);
+    }
+}

…ke/library/include/mathutils/mathutils.h …es/conan_cmake/library/src/mathutils.ixxexamples/conan_cmake/library/include/mathutils/mathutils.h renamed to examples/conan_cmake/library/src/mathutils.ixx examples/conan_cmake/library/include/mathutils/mathutils.h renamed to examples/conan_cmake/library/src/mathutils.ixx

@@ -1,8 +1,8 @@
-cmake_minimum_required(VERSION 3.24)
+cmake_minimum_required(VERSION 4.0)
 
 project(MathUtilsConsumer LANGUAGES CXX)
 
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 23)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 find_package(mathutils REQUIRED)

examples/conan_cmake/library/test_package/CMakeLists.txt

@@ -1,5 +1,5 @@
-#include <mathutils/mathutils.h>
-#include <iostream>
+import mathutils;
+import std;
 
 int main()
 {