export clock method to allow assignable in other packages #242
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For example:
```
cache := bigcache.NewBigCache(bigcache.DefaultConfig(time.Minute))
clock := &mockedClock{}
rf := reflect.ValueOf(cache).Elem().FieldByName("clock")
reflect.NewAt(rf.Type(), unsafe.Pointer(rf.UnsafeAddr())).Elem().Set(reflect.ValueOf(clock))
```
Without this change, it panics with `value of type *cache_test.mockedClock is not assignable to type bigcache.clock`
And it goes to `*cache_test.mockedClock cannot implement bigcache.Clock as it has a non-exported method and is defined in a difference package`
if we only export clock interface.
janisz
approved these changes
Sep 12, 2020
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For example:
Without this change, it panics with
value of type *cache_test.mockedClock is not assignable to type bigcache.clockAnd it goes to
*cache_test.mockedClock cannot implement bigcache.Clock as it has a non-exported method and is defined in a difference packageif we only export clock interface.Fix #241