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Standard Package
Definition:
The STANDARD package predefines a number of types, subtypes, and
functions which are visible to all design units.
Description
The STANDARD package is a part of the Language Specification. It
defines basic types, subtypes, and functions, together with operators
available for each of the (sub)types defined. The operators are
specified implicitly. Below is a complete list of declared types,
together with their predefined operators.
Contents:
The STANDARD package declares following types:
-
BOOLEAN (with predefined
operators "and", "or", "nand",
"nor", "xor", "xnor", "not",
"=", "/=", "<", "<=",
">", ">="),
-
BIT (with predefined
operators "and", "or", "nand",
"nor", "xor", "xnor", "not",
"=", "/=", "<", "<=",
">", ">="),
-
CHARACTER (with predefined
operators "=", "/=", "<",
"<=", ">", ">="),
-
SEVERITY_LEVEL (with
predefined operators "=", "/=", "<",
"<=", ">", ">="),
-
INTEGER (with predefined
operators "=", "/=", "<",
"<=", ">", ">=", "+",
"-", "abs", "*", "/",
"mod", "rem", "**"),
-
REAL (with predefined
operators "=", "/=", "<",
"<=", ">", ">=", "+",
"-", "abs", "*", "/", "**"),
-
TIME (with predefined
operators "=", "/=", "<",
"<=", ">", ">=", "+",
"-", "abs", "*", "/"),
-
STRING (with predefined
operators "=", "/=", "<",
"<=", ">", ">=", "&"),
-
BIT_VECTOR (with predefined
operators "and", "or", "nand",
"nor", "xor", "xnor", "not",
"sll", "srl", "sla", "sra",
"rol", "ror", "=", "/=",
"<", "<=", ">",
">=", "&"),
-
FILE_OPEN_KIND (with
predefined operators "=", "/=", "<",
"<=", ">", ">="),
-
FILE_OPEN_STATUS (with
predefined operators "=", "/=", "<",
"<=", ">", ">="),
and three subtypes:
-
DELAY_LENGTH (subtype of TIME),
-
POSITIVE (subtype of INTEGER),
-
NATURAL (subtype of INTEGER),
See Boolean, Bit, Character,
Integer, Real, Physical Types, String, Bit_Vector and File
for details on respective types.
Important Notes
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