scope_guard VS tomlplusplus

E.g. see this implementation: https://ricab.github.io/scope_guard/

But also I should make the point that you generally don't need to write defer-like statements at all when using RAII because it's implemented in the actual type. So it's only more code overall for types that are used only once or maybe twice.

Meanwhile I will check and use https://github.com/ricab/scope_guard

> low level details leak into your high level description of code, making the two coupled. You can’t make them invisible.

It's your job to make it not to leak. You have to write Modern C++ wrappers around C libs.

Similarity, The same can be said for Java. You can do low level in Java.

C++ is not C. C++ has backward compatibility with C.

Look at Boost folks, they wrote a Modern C++ wrapper around a C HTTP parser.

> And as I said, I’m familiar with RAII, it’s really great when the given object is scope-based, but can’t do anything otherwise.

Nothing is impossible.

You can use Scope Exit Guard with QT Widget.

https://github.com/ricab/scope_guard

> And if the new subclass has some non-standard object life cycle you HAVE to handle that case somewhere else, modifying another aspect of the code. It is not invisible, unless you want leaking code/memory corruption.

Again, Scope Exit Guards solve your problem!

Unless you want to make your own config file parser as an exercise (which is a good idea) I'd recommend using toml++.

It's a public repo - this one: https://github.com/marzer/tomlplusplus but thank you

For a live demo, see the toml++ homepage: https://marzer.github.io/tomlplusplus/

Added bonus, tomlplusplus is a solid C++ implementation, actively updated, and easy to drop into a project (header only, CMake, vcpkg, Conan, etc.). Very easy to use for what I've needed.

Key links: - Homepage: https://marzer.github.io/tomlplusplus/ - Repository: https://github.com/marzer/tomlplusplus - "What is TOML?": https://toml.io/

cmake_minimum_required(VERSION 3.23) project(testProj) set(CMAKE_CXX_STANDARD 23) set(FETCHCONTENT_BASE_DIR ${PROJECT_SOURCE_DIR}/${CMAKE_PROJECT_NAME}/libs CACHE PATH "Missing description." FORCE) include(FetchContent) FetchContent_Declare( tomlplusplus GIT_REPOSITORY https://github.com/marzer/tomlplusplus.git GIT_TAG v3.1.0 ) FetchContent_MakeAvailable(tomlplusplus) add_executable(testProj testProj/src/main.cpp) target_link_libraries(testProj tomlplusplus)

I use them in toml++ to store the path of the source document for all the data nodes parsed from that document. Storing it as a separate std::string allocation for every single object would have been very wasteful, and the alternative would have been to make an overall document class that owned everything, which I didn't want to do, so shared_ptr was a good compromise.

Key links: - Homepage: https://marzer.github.io/tomlplusplus/ - Repository: https://github.com/marzer/tomlplusplus - "What is TOML?": https://toml.io/

toml++ was both my first 'public'/open-source project, and my first ever attempt at a parser. There's a few things I'd do differently now if I were to write it from scratch, but I've learned a lot along the way (particularly about making things build 'clean' on multiple platforms).