[llvm-bugs] [Bug 24435] bitset::const_reference is an extension

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Aug 12 10:46:23 PDT 2015


Marshall Clow (home) <mclow.lists at gmail.com> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|---                         |WONTFIX

--- Comment #1 from Marshall Clow (home) <mclow.lists at gmail.com> ---
Yes, it is an extension.
The purpose is to increase consistency among the containers.

Consider the following code (from Howard):

#include <vector>
#include <bitset>
#include <cassert>

template <class Container>
test(Container& c, Container const& cc)
    using const_ref = typename Container::const_reference;
    assert(&c == &cc);
    const_ref cr = cc[0];
    assert(cr == c[0]);
    c[0] = 1;
    assert(cr == c[0]);

    std::vector<char> vc{1};
    test(vc, vc);
    std::bitset<1> bs;
    test(bs, bs);
    std::vector<bool> vb{1};
    test(vb, vb);

This compiles and runs w/o error in libc++.

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