Full-fidelity C++ docs from code.

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9/** Exit the program.

    The program will end immediately.

    @note Functions registered with `std::atexit` are not invoked.
*/
[[noreturn]]
void
terminate() noexcept;

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13/** Return the distance between two points

    This function returns the distance between two points
    according to the Euclidean distance formula.

    @param x0 The x-coordinate of the first point
    @param y0 The y-coordinate of the first point
    @param x1 The x-coordinate of the second point
    @param y1 The y-coordinate of the second point
    @return The distance between the two points
*/
double
distance(double x0, double y0, double x1, double y1);

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11/** Return true if a number is prime.

    @par Complexity

    Linear in n.

    @return Whether `n` is prime.
    @param n The number to test
*/
bool
is_prime(unsigned long long n) noexcept;

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15#include <type_traits>

/** Computes the integer square root \f$\lfloor\sqrt{value}\rfloor\f$.

    This function calculates the square root of a given integral value
    using bit manipulation, in $O(\log value)$ time.

    @throws std::invalid_argument if the input value is negative.

    @tparam T The type of the input value. Must be an integral type.
    @param value The integral value to compute the square root of.
    @return The square root of the input value.
 */
template <typename T>
std::enable_if_t<std::is_integral_v<T>, T> sqrt(T value);

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13struct abs_fn
{
    /** Compute the absolute value.

        @param x The input value.
        @return The absolute value of x.
    */
    double
    operator()(double x) const noexcept;
};

/** Return the absolute value of a number. */
constexpr abs_fn abs = {};