1.2. Namespaces
Namespaces are a mechanism for controlling the visibility of names within a program. They are intended to help facilitate the combination of program components from various sources by minimizing name conflicts between identifiers. Before we look at the namespace mechanism, let's make sure we understand the problem that namespaces were invented to solve.
Names not placed within a namespace are automatically placed in a single unnamed global declaration space. These names are visible throughout the program, regardless of whether they occur in the same or a separate program file. Each name in the global declaration space must be unique for the program to build. Global names make it difficult to incorporate independent components ...
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