77 lines
2.1 KiB
C++
77 lines
2.1 KiB
C++
// Copyright (C) 2011-2012 National ICT Australia (NICTA)
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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// -------------------------------------------------------------------
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//
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// Written by Conrad Sanderson - http://conradsanderson.id.au
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// Written by Ryan Curtin
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//! \addtogroup SpValProxy
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//! @{
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/**
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* Sparse value proxy class, meant to prevent 0s from being added to sparse
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* matrices. T1 should be either SpMat or SpSubview, and if it's not, bad news
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* is probably coming. This class only uses T1::add_element() and
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* T1::delete_element().
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*/
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template<typename T1>
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class SpValProxy
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{
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public:
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typedef typename T1::elem_type eT; // Convenience typedef
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friend class SpMat<eT>;
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friend class SpSubview<eT>;
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/**
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* Create the sparse value proxy.
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* Otherwise, pass a pointer to a reference of the value.
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*/
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arma_inline SpValProxy(uword row, uword col, T1& in_parent, eT* in_val_ptr = NULL);
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//! For swapping operations.
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arma_inline SpValProxy& operator=(const SpValProxy& rhs);
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template<typename T2>
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arma_inline SpValProxy& operator=(const SpValProxy<T2>& rhs);
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//! Overload all of the potential operators.
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//! First, the ones that could modify a value.
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arma_inline SpValProxy& operator=(const eT rhs);
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arma_inline SpValProxy& operator+=(const eT rhs);
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arma_inline SpValProxy& operator-=(const eT rhs);
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arma_inline SpValProxy& operator*=(const eT rhs);
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arma_inline SpValProxy& operator/=(const eT rhs);
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arma_inline SpValProxy& operator++();
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arma_inline SpValProxy& operator--();
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arma_inline eT operator++(const int);
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arma_inline eT operator--(const int);
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//! This will work for any other operations that do not modify a value.
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arma_inline operator eT() const;
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private:
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// Deletes the element if it is zero. Does not check if val_ptr == NULL!
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arma_inline arma_hot void check_zero();
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uword row;
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uword col;
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eT* val_ptr;
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T1& parent; // We will call this object if we need to insert or delete an element.
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};
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//! @}
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