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/usr/include/ITK-4.5/emulation/vcl_map.txx is in libinsighttoolkit4-dev 4.5.0-3.

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#ifndef vcl_emulation_map_txx_
#define vcl_emulation_map_txx_

#include "vcl_map.h"
#include "vcl_multimap.h"

#include "vcl_rbtree.txx"

// --- vcl_map ---

// * You can't call VCL_MAP_INSTANTIATE twice from within the same macro
// as the __LINE__ will be the same.

#undef VCL_MAP_INSTANTIATE
#define VCL_MAP_INSTANTIATE(T, Key, Comp) \
template class vcl_map<T, Key, Comp VCL_DFL_TMPL_ARG(vcl_alloc) >;\
/*fsm: the multimap should be instantiated with VCL_MULTIMAP_INSTANTIATE */ \
/*template class vcl_multimap<T,Key,Comp VCL_DFL_TMPL_ARG(vcl_alloc) >;*/ \
VCL_RBTREE_MAP_PAIR_INSTANTIATE(T, Key, __LINE__)

// This "identity" passthru gets __LINE__ expanded
#define VCL_RBTREE_MAP_PAIR_INSTANTIATE(T, Key, TAG) VCL_RBTREE_MAP_PAIRx_INSTANTIATE(T, Key, TAG)

#define VCL_RBTREE_MAP_PAIRx_INSTANTIATE(T, Key, TAG) \
typedef vcl_pair<T const, Key > RBPairc ## TAG;\
VCL_PAIR_const_INSTANTIATE(T const, Key);\
VCL_RBTREE_PAIR_INSTANTIATE(T, RBPairc ## TAG)

#define VCL_RBTREE_PAIR_INSTANTIATE(T, RBPair) \
VCL_RBTREE_INSTANTIATE(T,RBPair,vcl_select1st<RBPair >,vcl_less<T >);\
VCL_RBTREE_VALUE_INSTANTIATE(RBPair)

// -------------------- multimap

#undef VCL_MULTIMAP_INSTANTIATE
#define VCL_MULTIMAP_INSTANTIATE(T, Key, Comp) \
template class vcl_multimap<T, Key, Comp >

#endif // vcl_emulation_map_txx_