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Definintion of proto::context::callable_context<>
,
an evaluation context for proto::eval()
that fans out each node and calls the derived context type with the expressions constituents. If the derived context
doesn't have an overload that handles this node, fall back to some other context.
namespace boost { namespace proto { namespace context { template<typename Expr, typename Context> struct callable_eval; template<typename Context, typename DefaultCtx = proto::context::default_context> struct callable_context; } } }