comparison: src/generics/functions.h
src/generics/functions.h
- changeset 1429
- 80e8aaabeeed
- parent 1419
- f7c53002a990
- child 1430
- 6ce6d3da584f
equal
deleted
inserted
replaced
| 1428:ece049033adc | 1429:80e8aaabeeed |
|---|---|
| 23 | 23 |
| 24 /* | 24 /* |
| 25 * Returns whether the argument is reasonably close to zero. | 25 * Returns whether the argument is reasonably close to zero. |
| 26 */ | 26 */ |
| 27 template<typename T> | 27 template<typename T> |
| 28 bool isZero(T a) | 28 constexpr bool isZero(T a) |
| 29 { | 29 { |
| 30 return qFuzzyCompare(a + 1.0, 1.0); | 30 return qFuzzyCompare(a + 1.0, 1.0); |
| 31 } | 31 } |
| 32 | 32 |
| 33 template<typename T> | 33 template<typename T> |
| 41 { | 41 { |
| 42 return ::pow(value, 2); | 42 return ::pow(value, 2); |
| 43 } | 43 } |
| 44 | 44 |
| 45 template<> | 45 template<> |
| 46 inline int squared<int>(int value) | 46 constexpr int squared<int>(int value) |
| 47 { | 47 { |
| 48 return value * value; | 48 return value * value; |
| 49 } | 49 } |
| 50 | 50 |
| 51 // | 51 // |
| 66 return false; | 66 return false; |
| 67 } | 67 } |
| 68 | 68 |
| 69 // http://stackoverflow.com/a/18204188/3629665 | 69 // http://stackoverflow.com/a/18204188/3629665 |
| 70 template<typename T> | 70 template<typename T> |
| 71 inline int rotl10(T x) | 71 constexpr int rotl10(T x) |
| 72 { | 72 { |
| 73 return (((x) << 10) | (((x) >> 22) & 0x000000ff)); | 73 return (((x) << 10) | (((x) >> 22) & 0x000000ff)); |
| 74 } | 74 } |
| 75 | 75 |
| 76 template<typename T> | 76 template<typename T> |
| 77 inline int rotl20(T x) | 77 constexpr int rotl20(T x) |
| 78 { | 78 { |
| 79 return (((x) << 20) | (((x) >> 12) & 0x000000ff)); | 79 return (((x) << 20) | (((x) >> 12) & 0x000000ff)); |
| 80 } | 80 } |
| 81 | 81 |
| 82 // | 82 // |
| 83 // Get the amount of elements in something. | 83 // Get the amount of elements in something. |
| 84 // | 84 // |
| 85 template<typename T, size_t N> | 85 template<typename T, int N> |
| 86 int countof(T(&)[N]) | 86 constexpr int countof(T(&)[N]) |
| 87 { | 87 { |
| 88 return N; | 88 return N; |
| 89 } | 89 } |
| 90 | 90 |
| 91 [[maybe_unused]] | |
| 91 static inline int countof(const QString& string) | 92 static inline int countof(const QString& string) |
| 92 { | 93 { |
| 93 return string.length(); | 94 return string.length(); |
| 94 } | 95 } |
| 95 | 96 |
| 120 /* | 121 /* |
| 121 * Extracts the sign of 'value'. | 122 * Extracts the sign of 'value'. |
| 122 * From: https://stackoverflow.com/q/1903954 | 123 * From: https://stackoverflow.com/q/1903954 |
| 123 */ | 124 */ |
| 124 template<typename T> | 125 template<typename T> |
| 125 int sign(T value) | 126 constexpr int sign(T value) |
| 126 { | 127 { |
| 127 return (0 < value) - (value < 0); | 128 return (0 < value) - (value < 0); |
| 128 } | 129 } |
| 129 | 130 |
| 130 /* | 131 /* |
| 131 * Returns the maximum of a single parameter (the parameter itself). | 132 * Returns the maximum of a single parameter (the parameter itself). |
| 132 */ | 133 */ |
| 133 template <typename T> | 134 template <typename T> |
| 134 T max(T a) | 135 constexpr T max(T a) |
| 135 { | 136 { |
| 136 return a; | 137 return a; |
| 137 } | 138 } |
| 138 | 139 |
| 139 /* | 140 /* |
| 140 * Returns the maximum of two parameters. | 141 * Returns the maximum of two parameters. |
| 141 */ | 142 */ |
| 142 template <typename T> | 143 template <typename T> |
| 143 T max(T a, T b) | 144 constexpr T max(T a, T b) |
| 144 { | 145 { |
| 145 return a > b ? a : b; | 146 return a > b ? a : b; |
| 146 } | 147 } |
| 147 | 148 |
| 148 /* | 149 /* |
| 149 * Returns the maximum of n parameters. | 150 * Returns the maximum of n parameters. |
| 150 */ | 151 */ |
| 151 template <typename T, typename... Rest> | 152 template <typename T, typename... Rest> |
| 152 T max(T a, Rest&&... rest) | 153 constexpr T max(T a, Rest&&... rest) |
| 153 { | 154 { |
| 154 return max(a, max(rest...)); | 155 return max(a, max(rest...)); |
| 155 } | 156 } |
| 156 | 157 |
| 157 /* | 158 /* |
| 158 * Returns the minimum of a single parameter (the parameter itself). | 159 * Returns the minimum of a single parameter (the parameter itself). |
| 159 */ | 160 */ |
| 160 template <typename T> | 161 template <typename T> |
| 161 T min(T a) | 162 constexpr T min(T a) |
| 162 { | 163 { |
| 163 return a; | 164 return a; |
| 164 } | 165 } |
| 165 | 166 |
| 166 /* | 167 /* |
| 167 * Returns the minimum of two parameters. | 168 * Returns the minimum of two parameters. |
| 168 */ | 169 */ |
| 169 template <typename T> | 170 template <typename T> |
| 170 T min(T a, T b) | 171 constexpr T min(T a, T b) |
| 171 { | 172 { |
| 172 return a < b ? a : b; | 173 return a < b ? a : b; |
| 173 } | 174 } |
| 174 | 175 |
| 175 /* | 176 /* |
| 176 * Returns the minimum of n parameters. | 177 * Returns the minimum of n parameters. |
| 177 */ | 178 */ |
| 178 template <typename T, typename... Rest> | 179 template <typename T, typename... Rest> |
| 179 T min(T a, Rest&&... rest) | 180 constexpr T min(T a, Rest&&... rest) |
| 180 { | 181 { |
| 181 return min(a, min(rest...)); | 182 return min(a, min(rest...)); |
| 182 } | 183 } |
| 183 | 184 |
| 184 /* | 185 /* |
| 215 | 216 |
| 216 /* | 217 /* |
| 217 * Returns the empty sum. (recursion base) | 218 * Returns the empty sum. (recursion base) |
| 218 */ | 219 */ |
| 219 template<typename T> | 220 template<typename T> |
| 220 T sum() | 221 constexpr T sum() |
| 221 { | 222 { |
| 222 return {}; | 223 return {}; |
| 223 } | 224 } |
| 224 | 225 |
| 225 /* | 226 /* |
| 226 * Returns the sum of n arguments. | 227 * Returns the sum of n arguments. |
| 227 */ | 228 */ |
| 228 template<typename T, typename... Rest> | 229 template<typename T, typename... Rest> |
| 229 T sum(const T& arg, Rest&&... rest) | 230 constexpr T sum(const T& arg, Rest&&... rest) |
| 230 { | 231 { |
| 231 return arg + sum<T>(rest...); | 232 return arg + sum<T>(rest...); |
| 232 } | 233 } |
| 233 | 234 |
| 234 // Copy of qOverload so as to drop Qt version requirement from 5.7 to 5.5. | 235 // Copy of qOverload so as to drop Qt version requirement from 5.7 to 5.5. |
