Value Type Attributes in C#.NET

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Value Type Attributes
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Value type attributes are used to return the bounds of a type For instance, a type defined as shown in the following would have a low bound of 0 and a high bound of 7:
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TYPE state IS (0 TO 7);
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There are four predefined attributes in the value type attribute category: I T LEFT, which returns the left bound of a type or subtype I T RIGHT, which returns the right bound of a type or subtype I T HIGH, which returns the upper bound of a type or subtype I T LOW, which returns the lower bound of a type or subtype Attributes are specified by the character and then the attribute name The object preceding the is the object that the attribute is attached to The capital T in the preceding descriptions means that the object that the attribute is attached to is a type The character is pronounced tick among VHDL hackers Therefore, the first attribute in the preceding list is specified T tick left
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Predefined Attributes
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The left bound of a type or subtype is the leftmost entry of the range constraint The right bound is the rightmost entry of the type or subtype In the following example, the left bound is -32,767, and the right bound is 32,767:
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TYPE smallint IS -32767 TO 32767;
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The upper bound of a type or subtype is the bound with the largest value, and the lower bound is the bound with the lowest value In the preceding example, for the type smallint, the upper bound is 32,767, and the lower bound is -32,767 To use one of these value attributes, the type mark name is followed by the attribute desired For example, following is the syntax to return the left bound of a type:
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PROCESS(x) SUBTYPE smallreal IS REAL RANGE -10E6 TO 10E6; VARIABLE q : real; BEGIN q := smallreal LEFT; -- use of left returns -- -10E6 END test;
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In this example, variable q is assigned the left bound of type smallreal Variable q must have the same type as the bounds of the type for the assignment to occur (The assignment could also occur if variable q was cast into the appropriate type) After the assignment has occurred, variable q contains -10E6, which is the left bound of type smallreal In the next example, all of the attributes are used to show what happens when a DOWNTO range is used for a type:
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PROCESS(a) TYPE bit_range IS ARRAY(31 DOWNTO 0) OF BIT; VARIABLE left_range, right_range, uprange, lowrange : integer; BEGIN left_range := bit_range LEFT; -- returns 31 right_range := bit_range RIGHT; -- returns 0 uprange := bit_range HIGH; -- returns 31 lowrange := bit_range LOW;
-- returns 0 END PROCESS;
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This example shows how the different attributes can be used to return information about a type When ranges of a type are defined using (a TO b) where b > a, the LEFT attribute will always equal the LOW attribute; but when a range specification using (b DOWNTO a) where b > a is used, the HIGH and LOW can be used to determine the upper and lower bounds of the type Value type attributes are not restricted to numeric types These attributes can also be used with any scalar type Following is an example using enumerated types:
ARCHITECTURE b OF a IS TYPE color IS (blue, cyan, green, yellow, red, magenta); SUBTYPE reverse_color IS color RANGE red DOWNTO green; SIGNAL color1, color2, color3, color4, color5, color6, color7, color8 : color; BEGIN color1 <= color LEFT; color2 <= color RIGHT; color3 <= color HIGH; color4 <= color LOW; -- returns blue -- returns magenta -- returns magenta -- returns blue
color5 <= reverse_color LEFT; -- returns red color6 <= reverse_color RIGHT; -- returns green color7 <= reverse_color HIGH; -- returns red color8 <= reverse_color LOW; -- returns green END b;
This example illustrates how value type attributes can be used with enumerated types to return information about the type Signals color1 and color2 are assigned blue and magenta, respectively, the left and right bounds of the type It is easy to see how these values are obtained by examining the declaration of the type The left bound of the type is blue and the right bound is magenta What is returned for the HIGH and LOW attributes of an enumerated type The answer relates to the position numbers of the type For an integer and real type, the position numbers
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