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<div class="title">Compiling with clang++ </div> </div>
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<div class="textblock"><p>This library will compile successfully with clang >= 3.2. Clang however has by default a significantly wider set of warnings enabled than does gcc. In particular, it will complain if a template class declared with the struct keyword is specialized using the class keyword, or vice versa.</p>
<p>This is a nuisance because a number of template structs/classes mandated by the C++11 standard are intended to be specialized where necessary, most notably <a class="el" href="classstd_1_1hash.html" title="A specialization of std::hash for Cgu::Callback::FunctorArg, Cgu::Callback::SafeFunctorArg, Cgu::GobjHandle, Cgu::GvarHandle, Cgu::IntrusivePtr, Cgu::SharedHandle, Cgu::SharedLockHandle, Cgu::SharedPtr and Cgu::SharedLockPtr so that such objects may be keys of unordered associative containers. ">std::hash</a>, and (unless the library is compiled with the --without-smart-ptr-comp option) this library does indeed specialize <a class="el" href="classstd_1_1hash.html" title="A specialization of std::hash for Cgu::Callback::FunctorArg, Cgu::Callback::SafeFunctorArg, Cgu::GobjHandle, Cgu::GvarHandle, Cgu::IntrusivePtr, Cgu::SharedHandle, Cgu::SharedLockHandle, Cgu::SharedPtr and Cgu::SharedLockPtr so that such objects may be keys of unordered associative containers. ">std::hash</a> for <a class="el" href="classCgu_1_1Callback_1_1FunctorArg.html" title="Functor class holding a Callback::CallbackArg object. ">Cgu::Callback::FunctorArg</a>, <a class="el" href="classCgu_1_1Callback_1_1SafeFunctorArg.html" title="Functor class holding a Callback::CallbackArg object, with thread-safe reference count. ">Cgu::Callback::SafeFunctorArg</a>, <a class="el" href="classCgu_1_1GobjHandle.html" title="This is a handle for managing the reference count of GObjects. ">Cgu::GobjHandle</a>, <a class="el" href="classCgu_1_1GvarHandle.html" title="This is a handle for managing the reference count of GVariant objects. ">Cgu::GvarHandle</a>, <a class="el" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">Cgu::IntrusivePtr</a>, <a class="el" href="classCgu_1_1SharedHandle.html" title="This is a generic class for managing the lifetime of objects allocated on freestore. ">Cgu::SharedHandle</a>, <a class="el" href="classCgu_1_1SharedLockHandle.html" title="This is a generic class for managing the lifetime of objects allocated on freestore, with a thread safe reference count.. ">Cgu::SharedLockHandle</a>, <a class="el" href="classCgu_1_1SharedPtr.html" title="This is a smart pointer for managing the lifetime of objects allocated on freestore. ">Cgu::SharedPtr</a> and <a class="el" href="classCgu_1_1SharedLockPtr.html" title="This is a smart pointer for managing the lifetime of objects allocated on freestore, with a thread safe reference count. ">Cgu::SharedLockPtr</a> so that objects of such classes may be keys of unordered associative containers. The standard does not specify whether the <a class="el" href="classstd_1_1hash.html" title="A specialization of std::hash for Cgu::Callback::FunctorArg, Cgu::Callback::SafeFunctorArg, Cgu::GobjHandle, Cgu::GvarHandle, Cgu::IntrusivePtr, Cgu::SharedHandle, Cgu::SharedLockHandle, Cgu::SharedPtr and Cgu::SharedLockPtr so that such objects may be keys of unordered associative containers. ">std::hash</a> template is to be declared as a struct or a class: it only requires that the specialization is to have certain public functions and typedefs. Either declaration is standard conforming and legitimate.</p>
<p>This library declares <a class="el" href="classstd_1_1hash.html" title="A specialization of std::hash for Cgu::Callback::FunctorArg, Cgu::Callback::SafeFunctorArg, Cgu::GobjHandle, Cgu::GvarHandle, Cgu::IntrusivePtr, Cgu::SharedHandle, Cgu::SharedLockHandle, Cgu::SharedPtr and Cgu::SharedLockPtr so that such objects may be keys of unordered associative containers. ">std::hash</a> specializations as structs, because that is the (non-mandatory) format provided for in ยง20.8.12 of the C++11 standard for the specializations required by the standard. The versions of libstdc++ which come with gcc <= 4.7 do likewise. However the version of libstdc++ which comes with gcc-4.8 declares the <a class="el" href="classstd_1_1hash.html" title="A specialization of std::hash for Cgu::Callback::FunctorArg, Cgu::Callback::SafeFunctorArg, Cgu::GobjHandle, Cgu::GvarHandle, Cgu::IntrusivePtr, Cgu::SharedHandle, Cgu::SharedLockHandle, Cgu::SharedPtr and Cgu::SharedLockPtr so that such objects may be keys of unordered associative containers. ">std::hash</a> template as a class. This means that if clang is used with the version of libstdc++ which comes with gcc-4.8, by default warnings will be issued when the header files for the classes mentioned above are included in user code.</p>
<p>This can be avoided by compiling user code with clang with the -Wno-mismatched-tags compiler flag. </p>
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