[LLVMbugs] [Bug 22106] New: std::swap() doesn't work with multi-dimensional ranges

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22106

            Bug ID: 22106
           Summary: std::swap() doesn't work with multi-dimensional ranges
           Product: libc++
           Version: 3.4
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: pgriess at gmail.com
                CC: llvmbugs at cs.uiuc.edu, mclow.lists at gmail.com
    Classification: Unclassified

$ cat foo.cpp
#include <utility>

int main(int argc, char** argv) {
    int src[8][8];
    decltype(src) dest;

    std::swap(src, dest);

    return 0;
}

$ clang++ -stdlib=libc++ -std=c++11 foo.cpp
In file included from foo.cpp:1:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/utility:211:9:
error: call to function 'swap' that is neither visible in
      the template definition nor found by argument-dependent lookup
        swap(*__first1, *__first2);
        ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/utility:220:12:
note: in instantiation of function template
      specialization 'std::__1::swap_ranges<int (*)[8], int (*)[8]>' requested
here
    _VSTD::swap_ranges(__a, __a + _Np, __b);
           ^
foo.cpp:7:10: note: in instantiation of function template specialization
'std::__1::swap<int [8], 8>' requested here
    std::swap(src, dest);
         ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/utility:218:1:
note: 'swap' should be declared prior to the call site
swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np])
_NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
^
1 error generated.

$ clang++ --version
Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin14.0.0
Thread model: posix

Changing src to a 'int[8]' from 'int[8][8]' does not trigger the issue.

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