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Extra resources for Borland - Object Pascal Language Guide
When you need greater flexibility, however, there are mechanisms to circumvent strong typing. These include typecasting (see “Typecasts” on page 4-14), pointers (see “Pointers and pointer types” on page 5-25), variants (see “Variant types” on page 5-30), variant parts in records (see “Variant parts in records” on page 5-22), and absolute addressing of variables (see “Absolute addresses” on page 5-38). About types There are several ways to categorize Object Pascal data types: • Some types are predefined (or built-in); the compiler recognizes these automatically, without the need for a declaration.
Declarations The names of variables, constants, types, fields, properties, procedures, functions, programs, units, libraries, and packages are called identifiers. ) Identifiers must be declared before you can use them; the only exceptions are a few predefined types, routines, and constants that the compiler understands automatically, the variable Result when it occurs inside a function block, and the variable Self when it occurs inside a method implementation. A declaration defines an identifier and, where appropriate, allocates memory for it.
The outline below shows the taxonomy of Object Pascal data types. simple ordinal integer character Boolean enumerated subrange real string structured set array record file class class reference interface pointer procedural variant type identifier The standard function SizeOf operates on all variables and type identifiers. It returns an integer representing the amount of memory (in bytes) used to store data of the specified type. For example, SizeOf(Longint) returns 4, since a Longint variable uses four bytes of memory.