Re: History of and support for std::basic_string::back()

Bo Persson <>
Sat, 03 Aug 2013 14:24:48 +0200
Jorgen Grahn skrev 2013-08-03 10:13:

On Sat, 2013-08-03, JC wrote:

On Friday, August 2, 2013 9:58:19 PM UTC-4, Jorgen Grahn wrote:

On Sat, 2013-08-03, JC wrote:


C++11 an evolution of the C++ standard, reflected in revisions to the
C++ specifications?


Thanks! Do you know when back() was introduced [...]

That was the hard part of your question, so no. Sorry.

An ongoing problem with std::string is that it has its own section in
the standard (Clause 21) while the "real" containers are described in an
other section (Clause 23).

In the C++98 standard Clause 21 claims that basic_string has the same
interface as a reversible container (like std::vector) but if you check
the required member functions it actually doesn't. The container types
were improved and synchronized during standardization, but basic_string
wasn't always updated. Oops!

We can get some clues from this 2005 defect report:

where one user reports that it is already available on some implementations.

In C++11 it is required.

Bo Persson

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