Static_cast ?. XML

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static_cast

Usage: static_cast? <? Type-ID?>? (? Expression ?)

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This operator converts expression to the Type-ID type, but does not check the runtime type to ensure the conversion security.

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Note: static_cast cannot convert the const, volatile, or _ unaligned attribute of expression.

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It has the following usage:

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① It is used to convert the pointer or reference between a base class (parent class) and a derived class (subclass) in the class hierarchy.

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It is safe to perform upstream conversion (convert the pointer or reference of a derived class to a base class;

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When performing a downstream conversion (converting a base class pointer or reference to a derived class), it is not safe because there is no dynamic type check.

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② It is used for conversion between basic data types. For example, convert int to Char and convert int to enum. The security of such conversions must also be ensured by developers.

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③ Convert a null pointer to a null pointer of the target type.

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④ Convert any type of expression to void type.

?? What is the difference between static_cast and reinterpret_cast in C ++? In chapter 5 of C ++ primer, the compiler implicitly executes any type conversion, which can be displayed by static_cast. reinterpret_cast usually provides a lower-level re-interpretation for the bit mode of the operand?

1. static_cast in C ++ performs non-polymorphism conversion instead of the normal conversion operation in C. Therefore, it is used as an implicit type conversion. For example:

int?i;float?f?=?166.71;i?=?static_cast<int>(f);

In this case, the result is that the I value is 166.

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2. reinterpret_cast in C ++ converts data from one type to another. The so-called "usually provides lower-level re-interpretation for the bit mode of the operand" means re-interpretation of the data in the form of binary existence. For example:

??int?i;char?*p?=?"This?is?a?example.";i?=?reinterpret_cast<int>(p);?

In this case, the values of I and P are exactly the same. The purpose of reinterpret_cast is to interpret the value of P as an integer in binary (bit mode) mode and assign it to I, // I? It is also a pointer, an integer pointer. An obvious phenomenon is that there is no digital loss before and after conversion.

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Static_cast ?. XML