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Re: Implement N3762 string_view: a non-owning reference to a string.
- From: Daniel Krügler <daniel dot kruegler at gmail dot com>
- To: Ed Smith-Rowland <3dw4rd at verizon dot net>
- Cc: "libstdc++ at gcc dot gnu dot org" <libstdc++ at gcc dot gnu dot org>
- Date: Mon, 18 Nov 2013 15:08:31 +0100
- Subject: Re: Implement N3762 string_view: a non-owning reference to a string.
- Authentication-results: sourceware.org; auth=none
- References: <5285A634 dot 7070907 at verizon dot net>
2013/11/15 Ed Smith-Rowland <3dw4rd@verizon.net>:
> Greetings,
>
> As the title says. It's a pretty simple class" a non-mutating read-only
> view into a const CharT* or a basic_string.
>
> Built and tested on x86_64-linux.
>
> OK?
Sorry, if this is documented somewhere, but is this intended to implement
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3762.html
? I don't think that your implementation is valid, because it maps an
empty string view into a NULL data pointer. But according to the
specification of data() the return type, this isn't feasible:
<quote>
constexpr const charT* data() const noexcept;
Returns: A non-null pointer p such that p + i == &operator[](i) for
each i in [0,size()).
</quote>
- Daniel