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You define classes in headers, so they get defined in every TU. (And Wikipedia is somewhere between misleading and wrong about parts of the ODR, too.) It's objects and (non-inline) functions that are declared in headers and defined exactly once.

Roger Pate
– Roger Pate

2010-01-10 18:03:45 +00:00
Commented Jan 10, 2010 at 18:03
What is exactly the difference between "definition" and "declaration"?

Davide Valdo
– Davide Valdo

2010-01-10 18:32:05 +00:00
Commented Jan 10, 2010 at 18:32
A declaration only introduces a 'signature', but the definition really refers to function or method bodies. Its true that a class can be both declared and defined in one statement, but you would normally put this in a header file. A class can also be declared in a header, leaving its method bodies to be defined in a .cpp file.

quamrana
– quamrana

2010-01-10 18:57:55 +00:00
Commented Jan 10, 2010 at 18:57
1

Examples: class Declaration; class Definition {}; void function_declaration(); void function_definition() {} extern int global_obj_declaration; int global_obj_definition;

Roger Pate
– Roger Pate

2010-01-10 19:02:25 +00:00
Commented Jan 10, 2010 at 19:02

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