TotalView Users Guide - CI Wiki

Diving in Variable Windows
Figure 189: Dive in All
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Similarly, my_var.an_element[10] and my_var[10].an_element are also
expressions, since both TotalView and your program must figure out where
the data associated with the element resides.
The expression in the Expression field is dynamic. That is, you can tell
TotalView to evaluate what you enter before trying to obtain a memory
address. For example, if you enter my_var.an_element[i], TotalView evaluates
the value of i before it redisplays your information. A more complicated
example is my_var.an_element[i+1]. In this example, TotalView must
use its internal expression evaluation system to create a value before it
retrieves data values.
You can replace the variable expression with something completely different,
such as i+1, and TotalView simply displays the value produced by evaluating
the expression.
Chapter 17, “Evaluating Expressions,” on page 381 has a discussion of the
evaluation system and typing expressions in an eval point in the Tools >
Evaluate Window. In contrast, the expressions you can type in the
Expression List Window are restricted with the principal restriction being
that what you type cannot have side effects. For example, you cannot use
an expression that contains a function call or an operator that changes
memory, such as ++ or --.
302 Chapter 14: Examining and Changing Data
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