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d11d167713
Summary: The existing detection of a format member function has a couple of deficiencies: - the member function does not get detected if one calls formatv with an lvalue, because the template parameter gets deduced as T&, which fails the is_class check. - it also did not work if the function was called with a const variable because the template parameter would get deduced as const T&, again failing the is_class check. This fixes the problem by stripping the references in the uses_format_member template, to make sure the type is correctly detected as class. It also provides specializations of the has_FormatMember template for const and non-const members of the types in order to enable declaring the format member as a "const" function. I have added tests that verify that formatv can be now called in these scenarios. As some scenarios could not be verified at runtime (e.g. making sure that calling a non-const format member on a const object does *not* compile), I have also added some static_asserts which test the behaviour of the template classes used internally by formatv(). Reviewers: zturner Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D27525 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289040 91177308-0d34-0410-b5e6-96231b3b80d8 |
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