将代码从C++11转换为C++98的策略？

Question

I have a project written in C++11. As C++11 is widely accepted, the project works well up to now, until I have to run it in a environment which not support C++11.

I have already used std::shared_ptr , auto , std::intializer_list , nullptr enum class , chrono , std::vector<int> x{1,2,3,4} and many other C++11 technique everywhere in the project.

How can I move the big project in C++11 to C++98?

I apologize if it is a stupid problem, Thanks for your time.

Answer 1

Decide about each piece separately.

If that platform can run at least a subset of boost , you can probably just replace std::chrono and std::shared_ptr . You can also replace lambdas with BOOST_LOCAL_FUNCTION

Answer 2

I had to do something similar, but my challenge was co convert it from C++17 to C which was present on customer CentOS 7 (they used custom CentOS Image, and we were not allowed to install any new packages).

What I did was to throw out step by step all dependencies which used C++ elements and replace them with C variants. It took some time but it worked. Also looked after some other solution, but I was not able to find any.

You could always rewrite shared pointer, vector etc. in C.

Answer 3

Maybe not exactly what you ask but when I want to run code to another computer without support C++11 I will create docker with C++11 inside this computer. Hope this helps!

Answer 4

One solution is to try looking for C++ external libraries such as Boost and Qt, which could cover half of your requisites.

However some things are implementation-specific and upto you, such as the auto keyword, which you may choose to not use. (In fact if your using a proper debugger cum IDE, you'll get to check even complex data types in an instance)

Another alternative to that is replacing auto by templates, as pointed out here . (without boost)

Similarly, stuff like macros and variadic templates shouldn't be hard to cover.