C ++和Objc编译错误

Question

I have been trying to add MobileSynth to my application for some time now and I am only running into errors.

I have followed the steps here which explain how to add a project into another one.

When I compile, both projects are compiled correctly without errors, but the moment I try import the code into my objective C source code I get a large number of errors.

This is a screenshot of the errors.

Im sure there are more errors than these as there seems to be something wrong with the dependencies.

I also approved Xcodes recommendation to convert the project 2 (containing the objective C viewcontrollers with .mm extensions and the .cpp files) from an old 3.something version to the version 4 project type, and made the snapshot. Didnt seem to change anything.

I am not sure how to solve these issues. I would really appreciate any help.

Answer 1

使用using namespace代替namespace 。

Answer 2

You're aware that files that use C++ need the .mm extension. You also need to consider import dependencies. Since this header contains C++, any other file that imports it will also need to have the .mm extension. I'm almost positive that's what's happening to you.

I generally try to keep C++ quarantined to the implementation files for this very reason.

Also, for clarification on previous advice:

// Correct
namespace synth { class something; }

// Incorrect
using namespace synth { class something; } 

// Optional
namespace synth { class something; }
using namespace synth;