Amnon Heiman 0faf9cbb56 Adding back, find_last_of and append to sstring ...

This adds the back method that return a reference or const reference to
the last char in an sstring.

find_last_of, which return the index of the last occurance of a char in
the string.

And append with append C string to a string.

The logic and definition are similiar to the std::string.

Note that following the std::string definition, calling back on an empty
string is forbiden and the results are undefined.

Signed-off-by: Amnon Heiman <amnon@cloudius-systems.com>

2015-03-30 15:38:41 +03:00

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