https://svn.boost.org/trac10/ticket/3745 <p> According to <a href="http://www.boost.org/doc/libs/1_41_0/libs/tokenizer/char_delimiters_separator.htm">http://www.boost.org/doc/libs/1_41_0/libs/tokenizer/char_delimiters_separator.htm</a> char_delemiters_separator is a deprecated class and wasn't removed because of compatibility. There is no reason to keep going with this compatibility when the char_separator offers the same functionality. Currently it makes you to declare a new type definition for tokenizer&lt;char_separator&lt;char&gt;&gt; instead of using the one from boost. </p> <p> Thank you. </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/3745 Trac 1.4.3