Types of Objects With Deep Copy Semantics
Some programming languages—notably C# and D—use the term value type to refer to the types of objects for which assignment has deep copy semantics (as opposed to reference types, which have shallow copy semantics). For example:
int i1 = 42; // "int" is a value type. int i2 = i1; // i2 uses distinct storage for its value: // the value of i1 is "deep-copied" into i2. object o1 = i1; // "Boxing" (see below) from the value type "int" // to a reference type compatible with "object". object o2 = o1; // Since o1 and o2 have reference type, they // now refer to the same value storage; i.e., // o1 is "shallow-copied" into o2.Other programming languages—e.g., Java—do not formally define the term value type, but their practitioners informally use the term to refer to types with deep copy semantics (such as Java's primitive types).
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