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Aliases

Aliases are used when we want to insulate our code from details of the underlying machine. - note that naming a type after its representation than its purpose is not neccessarily a good idea.

1. typedef

cpp
typedef double decimal_places; // is equivalent to "using decimal_places = double;"

2. using

the using keyword can also be used to introduce a template alias.

template<typename T>
    using Vector = std::vector<T, my_allocator<T>>

but we cannot apply type specifiers, such as unsigned, to an alias.

using Char = char;
using Uchar = unsigned Char;  //error
using Uchar = unsigned char; // ok

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