blob: 6671d361e325cceac5aff74073cc24ae0edcc9af (
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diff --git i/libbase/accumulator.h w/libbase/accumulator.h
index 694cbd2..876c669 100644
--- i/libbase/accumulator.h
+++ w/libbase/accumulator.h
@@ -22,6 +22,7 @@
#include <boost/program_options/value_semantic.hpp>
#include <boost/any.hpp>
+#include <boost/version.hpp>
#include <functional>
#include <vector>
#include <string>
@@ -61,6 +62,11 @@ public:
virtual unsigned min_tokens() const { return 0; }
virtual unsigned max_tokens() const { return 0; }
+#if BOOST_VERSION >= 105900
+ /// There are no tokens, so this is indifferent.
+ virtual bool adjacent_tokens_only() const { return false; }
+#endif
+
/// Accumulating from different sources is silly.
virtual bool is_composing() const { return false; }
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