Danny Robson
20f81a7630
Package is no longer waif, after its seperation from the waif library/application. Hopefully there aren't any more dependencies...
93 lines
1.9 KiB
C++
93 lines
1.9 KiB
C++
/*
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* This file is part of libgim.
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*
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* Waif is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* Waif is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with libgim. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2010 Danny Robson <danny@blubinc.net>
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*/
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#ifndef __MATHS_HPP
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#define __MATHS_HPP
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template <typename T>
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T
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pow2 (T value);
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template <typename T>
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double
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rootsquare (T a, T b);
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/**
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* Check if two floating point numbers are approximately equal. Returns true
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* if the difference is less than a percentage of each individual value.
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*
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* @e maximum percentage difference for equal values
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*/
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template <typename T>
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bool
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almost_equal (T a, T b)
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{ return a == b; }
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template <typename Ta, typename Tb>
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bool
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almost_equal (Ta a, Tb b) {
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return almost_equal <decltype(a + b)> (static_cast<decltype(a + b)>(a),
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static_cast<decltype(a + b)>(b));
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}
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template <>
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bool
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almost_equal (float a, float b);
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template <>
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bool
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almost_equal (double a, double b);
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/// Variadic minimum
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template <typename T>
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const T&
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min (const T &a)
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{ return a ; }
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template <typename T, typename ...Args>
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const T&
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min (const T &a , const T &b , const Args &...args )
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{ return min ( b < a ? b : a, args...); }
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/// Variadic maximum
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template <typename T>
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const T&
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max (const T &a)
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{ return a ; }
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template <typename T, typename ...Args>
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const T&
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max (const T &a , const T &b , const Args &...args )
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{ return max ( b > a ? b : a, args...); }
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#endif // __MATHS_HPP
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