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Move double map to support module and generalize it (#1379)
* Move double map to support and generalize it * add docs back * reduces the number of required allocations
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@@ -14,12 +14,11 @@
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// You should have received a copy of the GNU General Public License
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// along with Substrate. If not, see <http://www.gnu.org/licenses/>.
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use double_map::StorageDoubleMap;
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use runtime_io::with_externalities;
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use runtime_primitives::testing::{Digest, DigestItem, H256, Header};
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use runtime_primitives::traits::{BlakeTwo256};
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use runtime_primitives::BuildStorage;
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use runtime_support::StorageMap;
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use runtime_support::{StorageMap, StorageDoubleMap};
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use substrate_primitives::{Blake2Hasher};
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use system::{Phase, EventRecord};
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use wabt;
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