C++ Programming Decoded 35 Static Members Belong to the Class Not the Object
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CHAPTERS
0:00 A Number With No Home
0:57 Where Can The Count Live?
1:29 One Shared Board On A Wall
2:28 Non-Static: One Per Object
3:11 The Static Data Member
4:05 Belongs To The Class
4:45 "Static" Does Not Mean Frozen
5:35 Wiring The Counter
6:32 Two Objects Born
7:01 A Scope Opens And Closes
7:55 What Static Data Is For
8:38 The Hidden "this" Pointer
9:25 The Member Function With No "this"
10:32 Call It With The Class Name
10:53 The Receptionist
11:39 Rule And Its Exception
12:20 The Old Way: Two Lines
12:52 Compiler Happy, Linker Furious
13:47 The Modern Fix: One Word
14:13 The One Thing To Carry
15:02 One Last Door: "friend"
KEY IDEAS
A static data member belongs to the class itself, not to any one object, so there is exactly one copy shared by every instance.
A non-static member is one-per-object: each instance gets its own private copy, the way each employee keeps a private notebook.
A static member is the bulletin board pinned to the wall: one board for the whole company that everyone reads and writes.
The word "static" here means one shared copy with a long lifetime, not "unchanging" — a static count can change all day long.
You can count live objects by incrementing a static count in the constructor and decrementing it in the destructor.
A static member exists before main runs and survives the death of any object, because it never lived inside an object.
A static member function runs with no object and receives no hidden "this" pointer.
Because it has no "this", a static member function can read static members but cannot touch non-static (per-object) members.
You call a static member function with the class name and the scope resolution operator, like Widget::alive(), with no instance needed.
Defining a static member the old way needed a separate definition in one source file, or the linker reports "undefined reference"; the modern fix is "inline static" in the header.
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