C++ Format VS CPM.cmake

Continuation passing monads form the basis of a perfectly valid and usable software architecture and programming pattern.

In the case of ostream and operator<<, this pattern reduces the number of intermediate objects that would otherwise be constructed.

If you object to iostream on religious or stylistic grounds, there's always fmt which is more like Go or Python string interpolation.[0]

0. https://fmt.dev

GitHub repo: fmtlib/fmt

cmake_minimum_required(VERSION 3.5) project(knn_cpp CXX) # Set up C++ version and properties include(CheckIncludeFileCXX) check_include_file_cxx(any HAS_ANY) check_include_file_cxx(string_view HAS_STRING_VIEW) check_include_file_cxx(coroutine HAS_COROUTINE) set(CMAKE_CXX_STANDARD 20) set(CMAKE_BUILD_TYPE Debug) set(CMAKE_CXX_STANDARD_REQUIRED ON) set(CMAKE_CXX_EXTENSIONS OFF) # Copy data file to build directory file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/iris.data DESTINATION ${CMAKE_CURRENT_BINARY_DIR}) # Download library usinng FetchContent include(FetchContent) FetchContent_Declare(matplotplusplus GIT_REPOSITORY https://github.com/alandefreitas/matplotplusplus GIT_TAG origin/master) FetchContent_GetProperties(matplotplusplus) if(NOT matplotplusplus_POPULATED) FetchContent_Populate(matplotplusplus) add_subdirectory(${matplotplusplus_SOURCE_DIR} ${matplotplusplus_BINARY_DIR} EXCLUDE_FROM_ALL) endif() FetchContent_Declare( fmt GIT_REPOSITORY https://github.com/fmtlib/fmt.git GIT_TAG 7.1.3 # Adjust the version as needed ) FetchContent_MakeAvailable(fmt) # Add executable and link project libraries and folders add_executable(${PROJECT_NAME} main.cc) target_link_libraries(${PROJECT_NAME} PUBLIC matplot fmt::fmt) aux_source_directory(lib LIB_SRC) target_include_directories(${PROJECT_NAME} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}) target_sources(${PROJECT_NAME} PRIVATE ${LIB_SRC}) add_subdirectory(tests)

Good catch, thanks! Fixed now. This explains why the difference was kinda low compared to another benchmark: https://github.com/fmtlib/fmt?tab=readme-ov-file#compile-tim....

> This is from C++23, right?

std::println is, yes.

> I wonder how available this is within compilers

https://en.cppreference.com/w/cpp/compiler_support says clang, gcc, and msvc all support it, though I don't know how recent those versions are off the top of my head.

In my understanding, with this specific feature, if you want a polyfill for older compilers, or to use some more cutting-edge features that haven't been standardized yet, https://github.com/fmtlib/fmt is available to you.

{fmt} has internal buffering but it's not yet exposed to users. There is a feature request for it: https://github.com/fmtlib/fmt/issues/2354. FILE buffering is not too bad but it can be easily optimized: https://www.zverovich.net/2020/08/04/optimal-file-buffer-siz....

Automatic use of operator<< when that exists was present in fmt until version 9.0.0. In version 9 you could use FMT_DEPRECATED_OSTREAM to opt in the old behaviour, but this too was removed in version 10.0.0. Now there is no way to automatically use operator<<.

You can install it https://github.com/fmtlib/fmt

Additionally, if you like low level stuff, check out libfmt (https://github.com/fmtlib/fmt) - not a big project, not difficult to understand. Or something like simdjson (https://github.com/simdjson/simdjson).

I like to pin GitHub dependencies using a commit hash, instead of a tag. You need a recent CPM.cmake file in your project for CPM to work.

C++20 brings std::format, improving C++ developer experience for formatting strings. If you have to use older standards, though, add fmtlib to your repo. It plays well with CMake and you can use CPM to add fmtlib to your project. The library supports many Rust format macro features, and makes code far cleaner when you need to do string interpolation with variables.

This is true for almost all projects but things are getting better. I use CPM for a couple of years now and get the experience desired

https://github.com/cpm-cmake/CPM.cmake

Yes, i found vcpkg terrible and FetchContent usually works way better. An amazing project is https://github.com/cpm-cmake/CPM.cmake, which automates FetchContent and makes dependencies mostly hassle free.

There's two completely different aspects to your question. 1) How to manage libraries in c++ without dying from cringe? I'd suggest you use cmake as the build system and grab library sources directly from GitHub using this tool: https://github.com/cpm-cmake/CPM.cmake 2) How to get apps that run under WSL to display windows-native windows? I'm not sure, but it's probably this: https://github.com/microsoft/wslg

I personally like to use something called CPMCmake for smaller personal projects, just because it has 0 requirements on the person that wants to use your project, they don't have to setup anything on their end, the only requirement is to have Cmake.

I personally would thoroughly recommend CPM. It's a CMake plugin which you install as a script in your CMake project and you can then use its function CPMFindPackage(), which basically wraps find_package() and ExternalProject() to use the former if the package is installed on the machine, or downloads it and builds it in-tree using the latter if not.

At first, I wanted to install it using Vcpkg but I ended up using CPM.cmake instead. Why? Because with Vcpkg on some platform it is messing up the config and choose a version of Python used in Vcpkg instead of the one I wanted to use. It is not that hard to fix, but why bother when I can install the library in one line with CPM.cmake

set(CPM_DOWNLOAD_LOCATION ${CMAKE_BINARY_DIR}/CPM.cmake) file(DOWNLOAD https://github.com/cpm-cmake/CPM.cmake/releases/latest/download/cpm.cmake ${CPM_DOWNLOAD_LOCATION}) include(${CPM_DOWNLOAD_LOCATION})

We're using vcpkg - tried conan previously. I think both are good, but both of them have their own flaws. You can also go with something like https://github.com/cpm-cmake/CPM.cmake if you just want something quick for a small project.