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maths: add constexpr to min,max,to_{radian,degree}

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This commit is contained in:
Danny Robson 2015-01-13 18:32:01 +11:00
parent 9e18b9b57a
commit a691f3b748
1 changed files with 15 additions and 10 deletions
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25
maths.hpp
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@ -146,49 +146,54 @@ exactly_zero (T a)
{ return exactly_equal (a, static_cast<T> (0)); }
const double PI = 3.141592653589793238462643;
//-----------------------------------------------------------------------------
constexpr double PI = 3.141592653589793238462643;
inline double
constexpr double
to_degrees (double radians) {
return radians * 180 / PI;
}
inline double
constexpr double
to_radians (double degrees) {
return degrees / 180 * PI;
}
//-----------------------------------------------------------------------------
/// Variadic minimum
template <typename T>
const T&
min (const T &a)
constexpr T
min (const T a)
{ return a; }
template <typename T, typename U, typename ...Args>
typename std::common_type<T, U>::type
constexpr typename std::common_type<T, U>::type
min (const T a , const U b , const Args &...args )
{ return min ( b < a ? b : a, args...); }
//-----------------------------------------------------------------------------
/// Variadic maximum
template <typename T>
const T&
max (const T &a)
constexpr T
max (const T a)
{ return a; }
template <typename T, typename ...Args>
const T&
max (const T &a , const T &b , const Args &...args )
constexpr T
max (const T a , const T b , const Args &...args )
{ return max ( b > a ? b : a, args...); }
//-----------------------------------------------------------------------------
template <typename T>
int sign (T val);
//-----------------------------------------------------------------------------
template <typename T, typename U, typename V>
T
limit (const T &&val, const U &&hi, const V &&lo) {