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Perry Kivolowitz 2024-02-28 16:12:29 -06:00
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section_1/structs/this.md
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@ -6,18 +6,17 @@ using. The exception to *this*, of course, are methods which are declared
as `static` which do *not* know which specific instance you are as `static` which do *not* know which specific instance you are
referring to - `static` methods are instance-agnostic. referring to - `static` methods are instance-agnostic.
Like many of the cool features of C++, *this* seemingly magical Like many of the cool features of C++, this seemingly magical
self-awareness is accomplished by slight-of-hand. In *this* chapter, we self-awareness of which instance a non-static method is called with, is
examine how *this* is done. accomplished by slight-of-hand.
In case the italics used up to now where ever the word *this* has been
used, the slight-of-hand involves the `this` pointer.
## `this` pointer ## `this` pointer
Every non-static method call employs a hidden first parameter. This Every non-static method call employs a hidden first parameter. That's
parameter is the `this` pointer which points to the specific instance it. That's the slight of hand. The hidden argument is the `this`
of the class being used. pointer. It points to the base address of the class or struct. Then, the
particular members of the right instance, are accessed the same way as
any struct basing memory addresses off a pointer.
Here is the [source code](./this.cpp) to our test harness: Here is the [source code](./this.cpp) to our test harness: