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Solaris Dynamic Tracing Guide
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Document Information


1.  Introduction

2.  Types, Operators, and Expressions

Identifier Names and Keywords

Data Types and Sizes


Arithmetic Operators

Relational Operators

Logical Operators

Bitwise Operators

Assignment Operators

Increment and Decrement Operators

Conditional Expressions

Type Conversions


3.  Variables

4.  D Program Structure

5.  Pointers and Arrays

6.  Strings

7.  Structs and Unions

8.  Type and Constant Definitions

9.  Aggregations

10.  Actions and Subroutines

11.  Buffers and Buffering

12.  Output Formatting

13.  Speculative Tracing

14.  dtrace(1M) Utility

15.  Scripting

16.  Options and Tunables

17.  dtrace Provider

18.  lockstat Provider

19.  profile Provider

20.  fbt Provider

21.  syscall Provider

22.  sdt Provider

23.  sysinfo Provider

24.  vminfo Provider

25.  proc Provider

26.  sched Provider

27.  io Provider

28.  mib Provider

29.  fpuinfo Provider

30.  pid Provider

31.  plockstat Provider

32.  fasttrap Provider

33.  User Process Tracing

34.  Statically Defined Tracing for User Applications

35.  Security

36.  Anonymous Tracing

37.  Postmortem Tracing

38.  Performance Considerations

39.  Stability

40.  Translators

41.  Versioning



Relational Operators

D provides the binary relational operators shown in the following table for use in your programs. These operators all have the same meaning as they do in ANSI-C.

Table 2-7 D Relational Operators

left-hand operand is less than right-operand
left-hand operand is less than or equal to right-hand operand
left-hand operand is greater than right-hand operand
left-hand operand is greater than or equal to right-hand operand
left-hand operand is equal to right-hand operand
left-hand operand is not equal to right-hand operand

Relational operators are most frequently used to write D predicates. Each operator evaluates to a value of type int which is equal to one if the condition is true, or zero if it is false.

Relational operators may be applied to pairs of integers, pointers, or strings. If pointers are compared, the result is equivalent to an integer comparison of the two pointers interpreted as unsigned integers. If strings are compared, the result is determined as if by performing a strcmp(3C) on the two operands. Here are some example D string comparisons and their results:

"coffee" < "espresso"
... returns 1 (true)
"coffee" == "coffee"
... returns 1 (true)
"coffee" >= "mocha"
... returns 0 (false)

Relational operators may also be used to compare a data object associated with an enumeration type with any of the enumerator tags defined by the enumeration. Enumerations are a facility for creating named integer constants and are described in more detail in Chapter 8, Type and Constant Definitions.