CODEWITHSUNDEEP
c++iosboostshared-ptrprecompiled-headers
Mark
Mark

Reputation: 7576

Error when including <boost/shared_ptr.hpp> in iOS pre-compiled header file

I'm developing an iOS app and am using the shared-pointer from the Boost library. My app is a little chunky, so I've been trying to lean it up. I think moving this line:

#include <boost/shared_ptr.hpp>

From individual files to the pre-compiled header file will save me some space since I heard every include of shared_ptr recompiles a different version and it's unclear whether the compiler is removing the duplicates.

When I move this line to the pch file I get a ton of compile-time errors, most of which are:

error: expected '=', ',', ';', 'asm' or '__attribute__' before 'boost'

I've changed the .pch file to be a sourcecode.cpp.h file in its info, but that hasn't helped.

Thoughts?

EDIT: Just verified that there are in fact duplicate copies of the compiled shared_ptr in my binary!

Upvotes: 1

Views: 1334

Answers (2)

Luca Bartoletti
Luca Bartoletti

Reputation: 2447

Are you included Boost headers in a .m file or .mm files? Because in the first case the compiler will use Objective-C, in the second case Objective-C++.

Upvotes: 1

justin
justin

Reputation: 104698

You probably have C or ObjC sources in your project.

In that case:

#if defined(__cplusplus)
#include <boost/shared_ptr.hpp>
#endif

Xcode (by default) creates a prefix for every language/dialect in your project, and if it doesn't, it's still manually #included. Unfortunately, moving a header to a pch could only add duplicates. It could reduce your build times, however.

Upvotes: 1

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