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Deduplicate the Store downcasting with a template

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This commit is contained in:
John Ericson 2022-03-09 15:27:48 +00:00
parent 678d1c2aa0
commit a03b1fd7f6
11 changed files with 39 additions and 41 deletions
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16
src/libstore/store-cast.hh Normal file
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@ -0,0 +1,16 @@
#pragma once
#include "store-api.hh"
namespace nix {
template<typename T>
T & require(Store & store)
{
auto * castedStore = dynamic_cast<T *>(&store);
if (!castedStore)
throw UsageError("%s not supported by store '%s'", T::operationName, store.getUri());
return *castedStore;
}
}