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jwezorek

Does using a local struct as a functor work in Xcode

6 posts in this topic

I'm planning on porting some code from VS2010 to Apple world and just discovered that XCode doesn't support lambdas. Was wondering if as a work-around I could use local structs as functors? [url="http://stackoverflow.com/questions/4569928/why-code-using-local-struct-as-parameter-for-stl-function-does-not-compile-in-g"]As discussed in this StackOverflow thread[/url] this is a C++11 feature, but was wondering if XCode happens to support it? (I don't currently own a mac, am just thinking ahead)
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xcode uses the GCC or LLVM compilers so it all depends on what versions of the compilers you have.
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What Calexus said. If you want to find out, you can install a g++ compiler on your Windows machine (i.e. through MinGW or Cygwin) and try it out. I think g++ has more C++11 support than VS2010, iirc (speaking of the latest versions, of course).
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Wait so you can use XCode with whatever version of GCC you want? Because the guy [url="http://stackoverflow.com/questions/7517449/xcode-support-of-lambda-functions"]in this thread[/url] is saying that if you want to use C++11 features you have to install GCC 4.6 and use that but from the command line or a 3rd party IDE e.g. Eclipse + CDT. Is this not right? -- because I kind of wanted to stick with XCode since I will be a newbie in Mac development.

I was thinking you had to use GCC 4.2 with XCode and was wondering if it supported passing local structs as functors to std::algorithms.
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[url="http://skurganov.blogspot.com/2010/10/integrating-gcc-44-to-xcode-macossnow.html"]In this blog post[/url], a guy got X Code working with GCC 4.4, and a commentor says he followed the directions and, with a slight change, got it working with GCC 4.6. Your milage may vary, however.
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For a list of C++11 features Clang currently supports, [url="http://clang.llvm.org/cxx_status.html"]see C++ and C++'11 Support in Clang[/url]. Lambda expressions are currently not implemented.

Your only choice for now (until Clang devs implement lambda support) is using MacPorts' GCC 4.5/4.6 compilers.

The extra command-line option would be -std=c++0x (in the next version of Clang and GCC it will be the proper -std=c++11).

Personally, I find MacPorts to be essential to install on my Mac if I want to get the latest version of software that is unavailable any other way.

p.s. This shows how you would see and [url="http://useyourloaf.com/blog/2011/3/21/compiler-options-in-xcode-gcc-or-llvm.html"]change the option in Xcode for the compiler [/url]you want to use for a newbie.
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[quote name='daviangel' timestamp='1327187321' post='4904965']
For a list of C++11 features Clang currently supports, see C++ and C++'11 Support in Clang. Lambda expressions are currently not implemented.
[/quote]
So if you choose, "LLVM Compiler" you use CLang as your front end. Which version of CLang is that? -- because according to the link you provided Clang 2.9 supports "Local and unnamed types as template arguments" which is the question in my OP.
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