Re: std::basic_string<> contiguous data?
Adam White wrote:
I've been writing a NetString class for network transmissions, which has
been internally implemented using a std::string.
To read data into the NetString from a network socket, I'd planned to
pre-allocate a large std::string (to use as a buffer), then slurp data
directly from the socket into the string via pointer indirection or by
using the std::string::data() array.
The pointer returned by std::string::data() is const; you can't
modify the memory it points to.
But is std::basic_string<>'s data guaranteed to be in a contiguous array?
I believe that TR1 clarified the intention that std::vector<> data be
stored contiguously - is that also true of std::basic_string<> ?
Even if it is contiguous, there is nothing which guarantees that
modifications through the pointer returned by data() will
affect the value of the string itself.
(In practice, of course, I think you'll probably be able to get
away with it in all real implementations:-).)
James Kanze (GABI Software) email:firstname.lastname@example.org
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