MathUtils.h File Reference

#include <array>
#include <cassert>
#include <cmath>
#include <cstdint>
#include <limits>
#include <type_traits>
#include <utility>
#include "donner/base/Utils.h"

Include dependency graph for MathUtils.h:

This graph shows which files directly or indirectly include this file:

Classes
struct	donner::MathConstants< T >
	Contains a set of math constants for the specified type (float or double). More...
struct	donner::MathConstants< float >
	Math constants for float. More...
struct	donner::MathConstants< double >
	Math constants for double. More...
struct	donner::QuadraticSolution< T >
	Holds the solution of a quadratic equation, as returned by SolveQuadratic. More...

Namespaces
namespace	donner
	Top-level Donner namespace, which is split into different sub-namespaces such as donner::svg and donner::css.

Functions
float	donner::NarrowToFloat (double from)
	Semantically represent a narrowing conversion, such as converting a double to a float, to make the conversion more visible.
template<typename T >
const T &	donner::Min (const T &a, const T &b)
	Returns minimum of the provided values.
template<typename T , typename... Args>
const T &	donner::Min (const T &a, const T &b, Args &&... args)
	Returns minimum of the provided values.
template<typename T >
const T &	donner::Max (const T &a, const T &b)
	Returns maximum of the provided values.
template<typename T , typename... Args>
const T &	donner::Max (const T &a, const T &b, Args &&... args)
	Returns maximum of the provided values.
float	donner::Abs (float a)
	Returns the absolute value of the number.
double	donner::Abs (double a)
	Returns the absolute value of the number.
template<typename T , typename = std::enable_if<std::is_integral<T>::value && std::is_signed<T>::value>>
T	donner::Abs (T a)
	Returns the absolute value of the number.
template<typename T , typename = std::enable_if<std::is_floating_point<T>::value>>
T	donner::Round (T orig)
	Round a floating point value to an integer.
template<typename T >
T	donner::Lerp (T a, T b, const float t)
	Returns linear interpolation of a and b with ratio t.
template<typename T >
const T	donner::Clamp (T value, T low, T high)
	Clamps a value between low and high.
template<typename T >
bool	donner::NearEquals (T a, T b, T tolerance=std::numeric_limits< T >::epsilon())
	Returns if a equals b, taking possible rounding errors into account.
template<typename T >
bool	donner::NearZero (T a, T tolerance=std::numeric_limits< T >::epsilon())
	Returns if a equals zero, taking rounding errors into account.
template<typename T , typename = std::enable_if<std::is_integral<T>::value>>
bool	donner::InRange (T var, T start, T end)
	Test if a variable is in a specific range, using an optimized technique that requires only one branch.
template<typename T >
QuadraticSolution< T >	donner::SolveQuadratic (T a, T b, T c)
	Solve a quadratic equation.

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Class Documentation

donner::MathConstants

struct donner::MathConstants

template<typename T>
struct donner::MathConstants< T >

Contains a set of math constants for the specified type (float or double).

Template Parameters

T

donner::QuadraticSolution

struct donner::QuadraticSolution

template<typename T>
struct donner::QuadraticSolution< T >

Holds the solution of a quadratic equation, as returned by SolveQuadratic.

Template Parameters

T

Collaboration diagram for donner::QuadraticSolution< T >:

Class Members
bool	hasSolution = false	True if the equation has solutions.
array< T, 2 >	solution	Solutions to the equation, valid if hasSolution is true.