Mixing QT with C++ Standard Library

[TauCeti]

Hi,

is it feasible to mix QT commands with Standard Library
commands?

1. as far as I know QT Container are compatible with
   std-<algorithm> and std-iterators. Is this correct?
   Is this feasible? Does anybody use it?
   Does one need special considerations?

2. What std commands do you use in your QT code?
   Can you provide examples?
   e.g. std::sort() seems useful for me.

3. Do you also mix std containers with QT container in one
   project?

Thanks for help.

[Christian Ehrlicher]

See https://doc.qt.io/qt-5/containers.html
I don't see a reason why it should not be mixed but you should not convert it the whole time.

[Kent-Dorfman]

I am generally paranoid of mixing Qt containers with STL containers, but have no qualms about using STL for platform independent modules that need to exist within a Qt app. I just make sure to do explicit conversions if the behaviour documentation doesn't meet my standards. It usually does not.

[JKSH]

@Kent-Dorfman said in Mixing QT with C++ Standard Library:

I am generally paranoid of mixing Qt containers with STL containers

Why's that? Have you experienced issues?

@TauCeti said in Mixing QT with C++ Standard Library:

is it feasible to mix QT commands with Standard Library
commands?

Yes.

1. as far as I know QT Container are compatible with
   std-<algorithm> and std-iterators. Is this correct?
   Is this feasible? Does anybody use it?
   Does one need special considerations?

Yes. Yes. Yes. Yes.

For your last question, see the Implicitly Shared Iterator Problem: https://doc.qt.io/qt-5/containers.html#implicit-sharing-iterator-problem

2. What std commands do you use in your QT code?
   Can you provide examples?
   e.g. std::sort() seems useful for me.

3. Do you also mix std containers with QT container in one
   project?

I quite happily do things like:

• Put QString in a std::pair
• Put std::shared_ptr<MyStruct> inside a QVector
• Use std::sort(), std::copy_if() on my QVector

However, I avoid converting a Qt container to an STL container and vice-versa, like @Christian-Ehrlicher said.