How to determine type equivalence in C++. Explain it in several sentences with a simple example.
Type Equality
The meaning of basic operations such as assignment (denoted by = in C) is specified in a language definition. Thus, for example, the meaning of statements such as
x = y;
here the value of object y is copied into the memory locations for variable x.
However, before an operation such as an assignment can be accepted by the translator, usually the types of the two operands must be the same (or perhaps compatible in some other specified way).
Thus a language translator must decide whether two types are equal in some cases. We now consider what it means to say that two types are "equal" (or equivalent).
There are two standard ways to determine whether two types are considered the same: name equivalence and structural equivalence.
Name equivalence is the most straightforward: two types are equal if, and only if, they have the same name. Thus, for example, in the code (using C/C++ syntax)
typedef struct { int data[100]; int count; } Stack; typedef struct { int data[100]; int count; } Set; Stack x, y; Set r, s;
if name equivalence is used in the language then x and y would be of the same type and r and s would be of the same type, but the type of x or y would not be equivalent to the type of r or s. This means that statements such as
x = y; r = s;
would be valid, but statements such as
x = r;
would not be valid (i.e., would not be accepted by a translator).
Using structural equivalence:, two types
are equal if, and only if, they have the same "structure",
which can be interpreted in different ways.
A strict interpretation would be that the names and types of each
component of the two types must be the same and must be listed in
the same order in the type definition.
A less stringent requirement would be that the component types must
be the same and in the same order in the two types, but the names
of the components could be different.
Again looking at the example above, using structural equivalence the two types Stack and Set would be considered equivalent, which means that a translator would accept statements such as
x = r;
How to determine type equivalence in C++. Explain it in several sentences with a simple example.
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