maths: label maths primitives pure

This commit is contained in:
Danny Robson 2015-01-28 14:57:20 +11:00
parent 9962bdca87
commit af7f01efd3

View File

@ -38,8 +38,8 @@ pow2 [[gnu::pure]] (T value)
template <typename T>
T
pow (T x, unsigned y);
constexpr T
pow [[gnu::pure]] (T x, unsigned y);
template <typename T>
@ -79,8 +79,8 @@ round_pow2 [[gnu::pure]] (T value);
template <typename T, typename U>
T
divup (const T a, const U b)
constexpr T
divup [[gnu::pure]] (const T a, const U b)
{ return (a + b - 1) / b; }
@ -100,25 +100,25 @@ digits [[gnu::pure]] (const T& value);
//-----------------------------------------------------------------------------
template <typename T>
int sign (T val);
int sign [[gnu::pure]] (T val);
//-----------------------------------------------------------------------------
// Comparisons
template <typename T>
bool
almost_equal (const T &a, const T &b)
almost_equal [[gnu::pure]] (const T &a, const T &b)
{ return a == b; }
template <>
bool
almost_equal (const float &a, const float &b);
almost_equal [[gnu::pure]] (const float &a, const float &b);
template <>
bool
almost_equal (const double &a, const double &b);
almost_equal [[gnu::pure]] (const double &a, const double &b);
template <typename Ta, typename Tb>
@ -126,7 +126,7 @@ typename std::enable_if<
std::is_arithmetic<Ta>::value && std::is_arithmetic<Tb>::value,
bool
>::type
almost_equal (Ta a, Tb b) {
almost_equal [[gnu::pure]] (Ta a, Tb b) {
return almost_equal <decltype(a + b)> (static_cast<decltype(a + b)>(a),
static_cast<decltype(a + b)>(b));
}
@ -137,7 +137,7 @@ typename std::enable_if<
!std::is_arithmetic<Ta>::value || !std::is_arithmetic<Tb>::value,
bool
>::type
almost_equal (const Ta &a, const Tb &b)
almost_equal [[gnu::pure]] (const Ta &a, const Tb &b)
{ return a == b; }
@ -146,20 +146,20 @@ almost_equal (const Ta &a, const Tb &b)
#pragma GCC diagnostic ignored "-Wfloat-equal"
template <typename T, typename U>
bool
exactly_equal (const T &a, const U &b)
exactly_equal [[gnu::pure]] (const T &a, const U &b)
{ return a == b; }
#pragma GCC diagnostic pop
template <typename T>
bool
almost_zero (T a)
almost_zero [[gnu::pure]] (T a)
{ return almost_equal (a, 0); }
template <typename T>
bool
exactly_zero (T a)
exactly_zero [[gnu::pure]] (T a)
{ return exactly_equal (a, static_cast<T> (0)); }
@ -170,26 +170,26 @@ constexpr float PI_f = 3.141592653589793238462643f;
//-----------------------------------------------------------------------------
constexpr double
to_degrees (double radians) {
to_degrees [[gnu::pure]] (double radians) {
return radians * 180 / PI_d;
}
constexpr float
to_degrees (float radians) {
to_degrees [[gnu::pure]] (float radians) {
return radians * 180 / PI_f;
}
//-----------------------------------------------------------------------------
constexpr float
to_radians (float degrees) {
to_radians [[gnu::pure]] (float degrees) {
return degrees / 180 * static_cast<float> (PI_f);
}
constexpr double
to_radians (double degrees) {
to_radians [[gnu::pure]] (double degrees) {
return degrees / 180 * PI_d;
}
@ -198,7 +198,7 @@ to_radians (double degrees) {
/// Variadic minimum
template <typename T>
constexpr T
min (const T a)
min [[gnu::pure]] (const T a)
{ return a; }
@ -208,7 +208,7 @@ constexpr typename std::enable_if<
std::is_integral<typename std::decay<T>::type>::value == std::is_integral<typename std::decay<U>::type>::value,
typename std::common_type<T,U>::type
>::type
min (const T a, const U b, Args ...args)
min [[gnu::pure]] (const T a, const U b, Args ...args)
{
return min (a < b ? a : b, std::forward<Args> (args)...);
}
@ -218,7 +218,7 @@ min (const T a, const U b, Args ...args)
/// Variadic maximum
template <typename T>
constexpr T
max (const T a)
max [[gnu::pure]] (const T a)
{ return a; }
@ -228,7 +228,7 @@ constexpr typename std::enable_if<
std::is_integral<typename std::decay<T>::type>::value == std::is_integral<typename std::decay<U>::type>::value,
typename std::common_type<T,U>::type
>::type
max (const T a, const U b, Args ...args)
max [[gnu::pure]] (const T a, const U b, Args ...args)
{
return max (a > b ? a : b, std::forward<Args> (args)...);
}
@ -237,7 +237,7 @@ max (const T a, const U b, Args ...args)
//-----------------------------------------------------------------------------
template <typename T, typename U, typename V>
T
limit (const T val, const U hi, const V lo)
limit [[gnu::pure]] (const T val, const U hi, const V lo)
{
return val > hi ? hi:
val < lo ? lo: