https://svn.boost.org/trac10/ticket/3188 <p> Currently all concepts are written for mutable objects although all containers and expressions can be either constant or mutable. </p> <p> I suggest to split the current concepts in basic concepts that contain the operations for both constant and mutable classes and special concepts only for mutable classes (which are a refinement of the constant concepts). </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/3188 Trac 1.4.3