gettext: boost-format

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1 15.3.24 Boost Format Strings
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1    Boost format strings are described in the documentation of the
1 ‘boost::format’ class, at
1 <http://www.boost.org/libs/format/doc/format.html>.  In summary, a
1 directive has either the same syntax as in a C format string, such as
1 ‘%1$+5d’, or may be surrounded by vertical bars, such as ‘%|1$+5d|’ or
1 ‘%|1$+5|’, or consists of just an argument number between percent signs,
1 such as ‘%1%’.
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