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Unreal Engine C++ API Reference > Developer > DerivedDataCache
References
| Module | DerivedDataCache |
| Header | /Engine/Source/Developer/DerivedDataCache/Public/DerivedDataBuildTypes.h |
| Include | #include "DerivedDataBuildTypes.h" |
Syntax
namespace UE
{
namespace DerivedData
{
enum EBuildPolicy
{
None = 0,
BuildLocal = 1 << 0,
BuildRemote = 1 << 1,
Build = BuildLocal | BuildRemote,
CacheQuery = 1 << 2,
CacheStoreOnQuery = 1 << 3,
CacheStoreOnBuild = 1 << 4,
CacheStore = CacheStoreOnQuery | CacheStoreOnBuild,
Cache = CacheQuery | CacheStore,
CacheKeepAlive = 1 << 5,
SkipData = 1 << 6,
Default = Build | Cache,
}
}
}
Values
| Name | Description |
|---|---|
| None | A value without any flags set. |
| BuildLocal | Allow local execution of the build function. |
| BuildRemote | Allow remote execution of the build function if it has a registered build worker. |
| Build | Allow local and remote execution of the build function. |
| CacheQuery | Allow a cache query to avoid having to build. |
| CacheStoreOnQuery | Allow a cache store to persist the build output when another cache store contains it. |
| CacheStoreOnBuild | Allow a cache store to persist the build output when the build function executes. |
| CacheStore | Allow a cache store to persist the build output. |
| Cache | Allow a cache query and a cache store for the build. |
| CacheKeepAlive | Keep records in the cache for at least the duration of the session. |
| SkipData | Skip fetching or returning data for the values. |
| Default | Allow cache query+store, allow local+remote build when missed or skipped, and fetch the value(s). |
Remarks
Flags to control the behavior of build requests.
The build policy flags can be combined to support a variety of usage patterns. Examples:
Build(Default): allow cache get; build if missing; return every value. Build(Build | CacheStore): never query the cache; always build; return every value. Build(Cache | CacheSkipData): allow cache get; never build; skip every value.
BuildValue(Default): allow cache get; build if missing; return one value. BuildValue(Build | CacheStore): never get from the cache; always build; return one value. BuildValue(Cache | CacheSkipData): allow cache get; never build; skip every value.