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change sm->new_block() to return an optional

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This commit is contained in:
Joe Thornber
2011-11-16 12:53:37 +00:00
parent 404ca5ba30
commit 876dd2427f
6 changed files with 59 additions and 22 deletions
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10
space_map.h
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@@ -5,6 +5,7 @@
#include "block_counter.h"
#include <boost/shared_ptr.hpp>
#include <boost/optional.hpp>
//----------------------------------------------------------------
@@ -25,7 +26,14 @@ namespace persistent_data {
virtual void inc(block_address b) = 0;
virtual void dec(block_address b) = 0;
virtual block_address new_block() = 0;
// FIXME: change these to return an optional, failure is
// not that rare if we're restricting the area that's
// searched.
typedef boost::optional<block_address> maybe_block;
virtual maybe_block new_block() = 0;
virtual maybe_block new_block(block_address begin, block_address end) = 0;
virtual bool count_possibly_greater_than_one(block_address b) const = 0;