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00017 #ifndef VCSN_ALGORITHMS_KRAT_EXP_PARTIAL_DERIVATION_HH
00018 # define VCSN_ALGORITHMS_KRAT_EXP_PARTIAL_DERIVATION_HH
00019 
00030 # include <vaucanson/design_pattern/design_pattern.hh>
00031 
00032 # include <set>
00033 
00034 namespace vcsn {
00035 
00038 
00039   template <class Series, class T, class Letter>
00040   std::pair<std::set<Element<Series, T> >, bool>
00041   partial_derivate(const Element<Series, T>& exp,
00042                    Letter a);
00043 
00046 } 
00047 
00048 
00049 # if !defined VCSN_USE_INTERFACE_ONLY && !defined VCSN_USE_LIB
00050 #  include <vaucanson/algorithms/krat_exp_partial_derivation.hxx>
00051 # endif // VCSN_USE_INTERFACE_ONLY
00052 
00053 #endif // ! VCSN_ALGORITHMS_KRAT_EXP_PARTIAL_DERIVATION_HH