One of the basic design decisions every framework designer faces is whether to design a type as a class махачкала сексзнакомтва reference type or as a struct a value type. Good understanding of the differences in the behavior of reference types and value types is махачкала сексзнакомтва in making this choice.
The first difference between reference types and value types we will consider is that reference types are allocated on the heap and garbage-collected, whereas value types are allocated either on the stack or inline in containing types and deallocated when the stack unwinds or when their containing type gets махачкала сексзнакомтва. Therefore, allocations and deallocations of value types are in general cheaper than allocations and deallocations махачкала сексзнакомтва reference types.
Next, arrays of reference types are allocated out-of-line, meaning the array махачкала сексзнакомтва are just references to instances of the reference type residing on the heap.
Value type arrays are allocated inline, meaning that the array elements are the actual махачкала сексзнакомтва of the value type.
Махачкала сексзнакомтва, allocations and deallocations of value type arrays are much cheaper than allocations and deallocations of reference type arrays.
In addition, in a majority of cases value type arrays exhibit much better махачкала сексзнакомтва of reference. The next difference is related to memory usage. Value types get boxed when cast to a reference type or one of the interfaces they implement.
They get unboxed when cast back to the value type. Because boxes are objects that are allocated on the heap and are garbage-collected, too махачкала сексзнакомтва boxing and unboxing can have a negative impact on the heap, the garbage collector, and ultimately the performance of the application. In contrast, no махачкала сексзнакомтва boxing occurs as reference types are cast.
Next, reference type assignments copy the reference, whereas value type assignments copy the entire value. Therefore, assignments of large reference махачкала сексзнакомтва are cheaper than assignments of large value types. Finally, reference types are махачкала сексзнакомтва by reference, whereas value types are passed by value.
Changes to an instance of a reference type affect all references pointing to the instance.
Value type instances are copied when they are passed by value. When an махачкала сексзнакомтва of a value type is changed, it of course does not affect any of its copies.
Because the copies are not created explicitly by the махачкала сексзнакомтва but are implicitly created when arguments are passed or return values are returned, value types that can be changed can be confusing to many users. Therefore, махачкала сексзнакомтва types should be immutable.
As a rule of thumb, the majority of types in a framework should be classes. There are, however, some situations in which the characteristics of a value type make it more appropriate to use structs. It logically represents a single value, similar to primitive types махачкала сексзнакомтваdoubleetc. Reprinted by permission of Pearson Education, Inc. Махачкала сексзнакомтва, Idioms, and Patterns for Reusable. Our new feedback system is built on GitHub Issues. Read about this change in our blog махачкала сексзнакомтва.
It has an instance size under 16 bytes. It will not have to be boxed frequently.
махачкала сексзнакомтва In all other cases, you should define your types as classes. Product feedback Sign in to give documentation махачкала сексзнакомтва Content feedback You may also leave feedback directly on GitHub. There are no open issues.
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