c++设计模式&&源代码

// // // Arrays.cpp // // #include <Arrays.h> #include<algorithm> #include<numeric> MJArray::MJArray(unsigned long size) : Size(size), Capacity(size) { if (Size >0) { ValuesPtr = new double[size]; EndPtr = ValuesPtr; EndPtr += size; } else { ValuesPtr=0; EndPtr=0; } } MJArray::MJArray(const MJArray& original) : Size(original.Size), Capacity(original.Size) { if (Size > 0) { ValuesPtr = new double[Size]; EndPtr = ValuesPtr; EndPtr += Size; std::copy(original.ValuesPtr, original.EndPtr, ValuesPtr); } else { ValuesPtr = EndPtr =0; } } MJArray::~MJArray() { if (ValuesPtr >0) delete [] ValuesPtr; } MJArray& MJArray::operator=(const MJArray& original) { if (&original == this) return *this; if (original.Size > Capacity) { if (Capacity > 0) delete [] ValuesPtr; ValuesPtr = new double[original.Size]; Capacity = original.Size; } Size=original.Size; EndPtr = ValuesPtr; EndPtr += Size; std::copy(original.ValuesPtr, original.EndPtr, ValuesPtr); return *this; } void MJArray::resize(unsigned long newSize) { if (newSize > Capacity) { if (Capacity > 0) delete [] ValuesPtr; ValuesPtr = new double[newSize]; Capacity = newSize; } Size = newSize; EndPtr = ValuesPtr + Size; } MJArray& MJArray::operator+=(const MJArray& operand) { #ifdef RANGE_CHECKING if ( Size != operand.size()) { throw("to apply += two arrays must be of same size"); } #endif for (unsigned long i =0; i < Size; i++) ValuesPtr[i]+=operand[i]; return *this; } MJArray& MJArray::operator-=(const MJArray& operand) { #ifdef RANGE_CHECKING if ( Size != operand.size()) { throw("to apply -= two arrays must be of same size"); } #endif for (unsigned long i =0; i < Size; i++) ValuesPtr[i]-=operand[i]; return *this; } MJArray& MJArray::operator/=(const MJArray& operand) { #ifdef RANGE_CHECKING if ( Size != operand.size()) { throw("to apply /= two arrays must be of same size"); } #endif for (unsigned long i =0; i < Size; i++) ValuesPtr[i]/=operand[i]; return *this; } MJArray& MJArray::operator*=(const MJArray& operand) { #ifdef RANGE_CHECKING if ( Size != operand.size()) { throw("to apply *= two arrays must be of same size"); } #endif for (unsigned long i =0; i < Size; i++) ValuesPtr[i]*=operand[i]; return *this; } ///////////////////////////// MJArray& MJArray::operator+=(const double& operand) { for (unsigned long i =0; i < Size; i++) ValuesPtr[i]+=operand; return *this; } MJArray& MJArray::operator-=(const double& operand) { for (unsigned long i =0; i < Size; i++) ValuesPtr[i]-=operand; return *this; } MJArray& MJArray::operator/=(const double& operand) { for (unsigned long i =0; i < Size; i++) ValuesPtr[i]/=operand; return *this; } MJArray& MJArray::operator*=(const double& operand) { for (unsigned long i =0; i < Size; i++) ValuesPtr[i]*=operand; return *this; } MJArray& MJArray::operator=(const double& val) { for (unsigned long i =0; i < Size; i++) ValuesPtr[i]=val; return *this; } double MJArray::sum() const { return std::accumulate(ValuesPtr,EndPtr,0.0); } double MJArray::min() const { #ifdef RANGE_CHECKING if ( Size==0) { throw("cannot take min of empty array"); } #endif RANGE_CHECKING double* tmp = ValuesPtr; double* endTmp = EndPtr; return *std::min_element(tmp,endTmp); } double MJArray::max() const { #ifdef RANGE_CHECKING if ( Size==0) { throw("cannot take max of empty array"); } #endif RANGE_CHECKING double* tmp = ValuesPtr; double* endTmp = EndPtr; return *std::max_element(tmp,endTmp); } MJArray MJArray::apply(double f(double)) const { MJArray result(size()); std::transform(ValuesPtr,EndPtr,result.ValuesPtr,f); return result; } /* * * Copyright (c) 2002 * Mark Joshi * * Permission to use, copy, modify, distribute and sell this * software for any purpose is hereby * granted without fee, provided that the above copyright notice * appear in all copies and that both that copyright notice and * this permission notice appear in supporting documentation. * Mark Joshi makes no representations about the * suitability of this software for any purpose. It is provided * "as is" without express or implied warranty. */