20Additional Library Utilities
RATIOS
The Ratio library allows you to exactly represent any finite rational number that you can use at compile time. Ratios are used in the std::chrono::duration class discussed in the next section. Everything is defined in the <ratio> header file and is in the std namespace. The numerator and denominator of a rational number are represented as compile-time constants of type std::intmax_t, which is a signed integer type with the maximum width supported by a compiler. Because of the compile-time nature of these rational numbers, using them might look a bit complicated and different than what you are used to. You cannot define a ratio object the same way as you define normal objects, and you cannot call methods on it. Instead, you need to use type aliases. For example, the following line ...
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