mathlib double and single-precision floating-point functions

The math library, mathlib, provides double and single-precision functions for mathematical calculations. For example, to calculate a cube root, you can use cbrt() (double-precision) or cbrtf() (single-precision).

ISO/IEC 14882 specifies that in addition to the double versions of the math functions in <cmath>, C++ adds float (and long double) overloaded versions of these functions. The ARM implementation extends this in scope to include the additional math functions that do not exist in C89, but that do exist in C99.

In C++, std::cbrt() on a float argument selects the single-precision version of the function, and the same type of selection applies to other floating-point functions in C++.

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