How deeply does Learn C++ by Example cover using keyword?

Defines aliases through practical examples and notes template-family support, but stops short of a full syntax catalogue.

Using keyword

As explained in Learn C++ by Example

A using statement is C++ syntax that introduces a name or defines an alias for a type or declaration.

The using keyword creates an alias for an existing type or declaration. It offers a clearer alternative to typedef and can describe families of templates. section 8.2 section 8.4

Naming tuple and pair types

A lookup table can use short aliases instead of repeating long compound types: state_t names a tuple containing two outcomes and a choice, while last_choices_t names a pair of choices. The aliases make the state representation easier to read. section 8.2

Defining a custom duration

A type alias can give a meaningful name to a complex chrono duration. The centuries alias combines a long-long representation with a period calculated from years and hecto, then behaves like other duration types. section 4.2.2

How Learn C++ by Example covers it

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Related concepts

typedefalternative to · typedef is a C and C++ declaration mechanism that introduces an alternative name for an existing type.
type aliasequivalent to · A type alias is a declaration that gives an existing type an alternative name without creating a distinct type or representation.
resource acquisition is initializationimplements · Resource acquisition is initialization (RAII) is a resource-management pattern that ties resource ownership and release to the lifetime of an object or scope.

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