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/*
* Copyright (c) 2003 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
template<class T, T MV>
class ModNum {
private:
T value;
// Compiler should optimize this
void setValue(T n) { value = n % MV; }
public:
ModNum() {}
ModNum(T n) { setValue(n); }
ModNum(const ModNum<T, MV> &n) : value(n.value) {}
ModNum operator=(T n) {
setValue(n);
return *this;
}
const ModNum operator=(ModNum n) {
value = n.value;
return *this;
}
// Return the value if object used as RHS
operator T() const { return value; }
//
// Operator "+="
//
const ModNum<T, MV> operator+=(ModNum<T, MV> r) {
setValue(value + r.value);
return *this;
}
const ModNum<T, MV> operator+=(T r) {
setValue(value + r);
return *this;
}
//
// Operator "-="
//
const ModNum<T, MV> operator-=(ModNum<T, MV> r) {
setValue(value - r.value);
return *this;
}
const ModNum<T, MV> operator-=(T r) {
setValue(value - r);
return *this;
}
//
// Operator "++"
//
// PREFIX (like ++a)
const ModNum<T, MV> operator++() {
*this += 1;
return *this;
}
// POSTFIX (like a++)
const ModNum<T, MV> operator++(int) {
ModNum<T, MV> rv = *this;
*this += 1;
return rv;
}
//
// Operator "--"
//
// PREFIX (like --a)
const ModNum<T, MV> operator--() {
*this -= 1;
return *this;
}
// POSTFIX (like a--)
const ModNum<T, MV> operator--(int) {
ModNum<T, MV> rv = *this;
*this -= 1;
return rv;
}
};
//
// Define operator "+" like this to avoid creating a temporary
//
template<class T, T MV>
inline ModNum<T, MV>
operator+(ModNum<T, MV> l, ModNum<T, MV> r) {
l += r;
return l;
}
template<class T, T MV>
inline ModNum<T, MV>
operator+(ModNum<T, MV> l, T r) {
l += r;
return l;
}
template<class T, T MV>
inline ModNum<T, MV>
operator+(T l, ModNum<T, MV> r) {
r += l;
return r;
}
//
// Define operator "-" like this to avoid creating a temporary
//
template<class T, T MV>
inline ModNum<T, MV>
operator-(ModNum<T, MV> l, ModNum<T, MV> r) {
l -= r;
return l;
}
template<class T, T MV>
inline ModNum<T, MV>
operator-(ModNum<T, MV> l, T r) {
l -= r;
return l;
}
template<class T, T MV>
inline ModNum<T, MV>
operator-(T l, ModNum<T, MV> r) {
r -= l;
return r;
}
//
// Comparison operators
// (all other cases are handled with conversons)
//
template<class T, T MV>
inline bool
operator<(ModNum<T, MV> l, ModNum<T, MV> r) {
return l.value < r.value;
}
template<class T, T MV>
inline bool
operator>(ModNum<T, MV> l, ModNum<T, MV> r) {
return l.value > r.value;
}
template<class T, T MV>
inline bool
operator==(ModNum<T, MV> l, ModNum<T, MV> r) {
return l.value == r.value;
}
template<class T, T MV>
inline bool
operator<=(ModNum<T, MV> l, ModNum<T, MV> r) {
return l.value <= r.value;
}
template<class T, T MV>
inline bool
operator>=(ModNum<T, MV> l, ModNum<T, MV> r) {
return l.value >= r.value;
}
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