Define basic project structure

CMakeLists.txt

+cmake_minimum_required(VERSION 3.13) # 3.13 is required for target_link_options
+project(simucene CXX)
+
+if(NOT CMAKE_BUILD_TYPE)
+    set(CMAKE_BUILD_TYPE "Release")
+endif()
+message(STATUS "Build type: ${CMAKE_BUILD_TYPE}")
+
+find_package (Eigen3 3.3 REQUIRED NO_MODULE)
+
+include(cmake/shared_settings.cmake)
+
+add_subdirectory(simucene)

README.md

+# cpp_starter
+
+A hello world C++ application using cmake and Eigen
+
+## Dependencies
+
+- a modern C++ compiler (i.e. one that supports C++17 features, ex. gcc 7+)
+- cmake 3.13 or newer
+- Eigen3 (installable via apt, yum, or homebrew)
+
+## Building
+
+From the project's root directory,
+
+```
+mkdir build
+cd build
+cmake ..
+make
+```
+
+Tips:
+- you can build using multiple threads at once using e.g. `make -j4`
+- you can specify a specific compiler using `cmake .. -DCMAKE_CXX_COMPILER=g++-8`
+- for debugging symbols use `cmake .. -DCMAKE_BUILD_TYPE=Debug`
+
+## Running
+
+From the build directory,
+
+```
+cpp_starter/cpp_starter
+```

cmake/shared_settings.cmake

+# This file defines an interface library used to add common compile flags to all libraries and
+# executables.
+
+#---------------------------------------------------------------------------------------------------
+add_library(shared_settings INTERFACE)
+
+# Speed flags
+target_compile_options(shared_settings INTERFACE -march=native -ffast-math)
+
+# Warning flags
+target_compile_options(shared_settings INTERFACE
+    -Wall
+    -Wcast-align
+    -Wcast-qual
+    -Wextra
+    -Wundef
+    -Wzero-as-null-pointer-constant
+    -pedantic
+)

simucene/CMakeLists.txt

+add_library(simucene_lib
+    my_class.cpp
+    my_class.h
+    vector.h
+)
+target_include_directories(simucene_lib PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+target_link_libraries(simucene_lib shared_settings Eigen3::Eigen)
+target_compile_features(simucene_lib PUBLIC cxx_std_17)
+
+add_executable(simucene
+    main.cpp
+)
+target_link_libraries(simucene shared_settings simucene_lib)

simucene/main.cpp

+#include "my_class.h"
+#include "vector.h"
+#include <iostream>
+
+using namespace cpp_starter;
+
+//--------------------------------------------------------------------------------------------------
+int main(int const, char const**) {
+    MyClass my_class("world");
+    my_class.hello();
+
+    Vector3<double> x = {0, 1, 2};
+    x = exp(x.array());
+    std::cout << x << '\n';
+
+    return 0;
+}

simucene/my_class.cpp

+#include "my_class.h"
+
+#include <iostream>
+
+namespace cpp_starter {
+
+//..................................................................................................
+void MyClass::hello() const {
+    std::cout << "Hello, " << name_ << '\n';
+}
+
+}

simucene/my_class.h

+#ifndef CPP_STARTER_MY_CLASS_H
+#define CPP_STARTER_MY_CLASS_H
+
+#include <string>
+
+namespace cpp_starter {
+
+//--------------------------------------------------------------------------------------------------
+class MyClass {
+public:
+    MyClass(std::string const& name): name_(std::move(name)) {}
+
+    void hello() const;
+
+private:
+    std::string name_;
+};
+
+}
+
+#endif

simucene/vector.h

+#ifndef CPP_STARTER_VECTOR_H
+#define CPP_STARTER_VECTOR_H
+
+#include <Eigen/Core>
+
+namespace cpp_starter {
+
+//--------------------------------------------------------------------------------------------------
+template <typename T>
+using Vector2 = Eigen::Matrix<T, 2, 1>;
+
+//--------------------------------------------------------------------------------------------------
+template <typename T>
+using Vector3 = Eigen::Matrix<T, 3, 1>;
+
+//--------------------------------------------------------------------------------------------------
+template <typename T>
+using VectorX = Eigen::Matrix<T, Eigen::Dynamic, 1>;
+
+}
+
+#endif