On 7/7/2015 7:18 AM, Paul A. Bristow wrote:

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-----Original Message----- From: Boost [mailto:boost-bounces@lists.boost.org] On Behalf Of Beman Dawes Sent: 05 July 2015 13:34 To: Boost Developers List Subject: [boost] [string_ref] [utility] Add string_view?

Boost has shipped string_ref since 1.53. See www.boost.org/doc/libs/1_58_0/libs/utility/doc/html/string_ref.html

In the meantime, the C++ committee has shipped a final version, named string_view, in the Library Fundamentals TS. See http://www.open- std.org/jtc1/sc22/wg21/docs/papers/2015/n4480.html#string.view

In addition to the name change, the interface in the TS more closely mimics the std::basic_string interface.

I'd really like to see the final TS basic_string_view added to Boost so I can start using it now. Using basic_string_ref, and then later having to rename all uses, is less attractive. I suspect others may feel the same way.

Because a Boost basic_string_view would be an implementation of a standard library TS class, and because basic_string_ref is already in Boost, it seems a min-review would be sufficient rather than a formal review. So what I'm proposing here is to create a basic_string_view branch of the utility repo, and start working on basic_string_view there. Once it is reasonably compliant with the TS and Boost doc requirements we would hold a mini-review and then merge the branch to develop, and once stable, to release.

"No standardization without implementation - or we'll throw more stuff in Boston harbour!"

We're too smart to throw good implemenTaTion away any more.

Go for it.

On 8 July 2015 at 09:43, Marshall Clow wrote:

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I'd really like to see the final TS basic_string_view added to Boost so I can start using it now.

use a typedef for now; and I'll update the boost implementation post 1.59 release.

You can't use a typedef; it's a template. You can use a "using" clause, but that requires C++11 or later. -- Nevin ":-)" Liber mailto:nevin@eviloverlord.com (847) 691-1404

On 8 July 2015 at 11:54, Marshall Clow wrote:

On Wed, Jul 8, 2015 at 9:15 AM, Nevin Liber wrote:

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On 8 July 2015 at 09:43, Marshall Clow wrote:

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I'd really like to see the final TS basic_string_view added to Boost so I can start using it now.

use a typedef for now; and I'll update the boost implementation post 1.59 release.

You can't use a typedef; it's a template.

You can use a "using" clause, but that requires C++11 or later.

string_ref is a real type; it's a specialization of basic_string_ref, which is a template.

typedef basic_string_ref string_ref;

Is the final goal to have boost::*string_view and boost::*string_ref removed? Right now, I have code that takes both std::experimental::string_view and boost::string_ref in interfaces, so the typedef doesn't change anything. I also have code that uses std::experimental::basic_string_view and boost::basic_string_ref, and the typedef doesn't work. Sure, we can add typedefs for the four concrete types, but I don't know if there really is an audience who needs that, if the interface isn't the one which matches the TS. The other downside to a typedef is that people can use string_view and string_ref interchangeably, which can lead to porting problems in the future. -- Nevin ":-)" Liber mailto:nevin@eviloverlord.com (847) 691-1404