C tagged union example

A tagged union is a type-checked union . That means you can no longer write to the union using one member type, and read it back using another. Tagged union enforces type checking by inserting additional bits into the union to store how the union was initially accessed.

C/C++ In C and C++, untagged unions are expressed nearly exactly like structures (structs), except that each data member begins at the same location in memory . The data members, as in structures, need not be primitive values, and in fact may be structures or even other unions.

In computer science, a tagged union, also called a variant, variant record, choice type, discriminated union, disjoint union, sum type or coproduct, is a data structure used to hold a value that could take on several different, but fixed, types .

A tagged union is a data structure that holds several different data types, each of them distinguishable from one another using a discriminating property (usually called a “tag”).10 Nis 2020