将 Python 变量传递给我的 C++ 脚本和 g++ 调用

Question

In my Python script I run my C++ script using:

os.system('g++ -std=c++0x mutualcepepe.cpp -o mutualout')

It works, but I want to pass my Python changeable (user defines its value) variable to C++ in this command line, for example variable:

threshold = 1.33

(it can be also a string I can cast it to float in C++ script)

I tried even to pass the exact value:

os.system('g++ -std=c++0x mutualcepepe.cpp 1.33 -o mutualout')

or:

os.system('g++ -std=c++0x mutualcepepe.cpp -o mutualout' 1.33)

but I still get the same error:

g++: error: 1.33 (or threshold): No such file or directory

I searched for solutions on the net, but I didn't find an answer.

I have other idea to put ONLY this value in other text file which I will open and get the value, but still want to to this a little bit more elegantly.

Is there a way to pass that variable which wouldn't be considered by g++ as a directory?

Answer 1

You could use the -D option to add a macro:

g++ -D "threshold = 1.33" ...

then you would refer to the macro value threshold in mutualcepepe.cpp .