Suffix for chrono literals

[Howard Hinnant]

On Jul 23, 2013, at 11:56 AM, Marshall Clow <mclow.lists at gmail.com> wrote:

> On Jul 22, 2013, at 2:09 PM, Marshall Clow <mclow.lists at gmail.com> wrote:
> 
>> Implements the "s" suffix for chrono literals as called for in N3642 + tests.

Thanks Marshall!

Just a few nits:

   test/utilities/time/chrono.literals.pass.cpp

should be:

   test/utilities/time/time.duration/time.duration.literals/chrono.literals.pass.cpp

I've added a comment concerning the inline on namespace literals as we did for <string>.

I've added static_cast for each of the integral duration udl's along the lines of:

	constexpr chrono::hours operator"" h(unsigned long long __h)
	{
		return chrono::hours(static_cast<chrono::hours::rep>(__h));
	}

Patch enclosed for this.

Please commit with these changes.

Thanks,
Howard
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