Mercurial > ~dholland > hg > ag > index.cgi
diff oldclasslib/include/array.h @ 0:13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
author | David A. Holland |
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date | Sat, 22 Dec 2007 17:52:45 -0500 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/oldclasslib/include/array.h Sat Dec 22 17:52:45 2007 -0500 @@ -0,0 +1,116 @@ +/* + * AnaGram, a System for Syntax Directed Programming + * + * Array Storage Class Definition + * + * Please note that the entire class is defined in this module. There + * is no supplementary code module. + * + * Copyright 1993 Parsifal Software. All Rights Reserved. + * + * This software is provided 'as-is', without any express or implied + * warranty. In no event will the authors be held liable for any damages + * arising from the use of this software. + * + * Permission is granted to anyone to use this software for any purpose, + * including commercial applications, and to alter it and redistribute it + * freely, subject to the following restrictions: + * + * 1. The origin of this software must not be misrepresented; you must not + * claim that you wrote the original software. If you use this software + * in a product, an acknowledgment in the product documentation would be + * appreciated but is not required. + * 2. Altered source versions must be plainly marked as such, and must not be + * misrepresented as being the original software. + * 3. This notice may not be removed or altered from any source distribution. + */ + +#ifndef ARRAY_H +#define ARRAY_H + +#include <assert.h> +#include <stdio.h> +#include <string.h> + +// some forward decls required by current C++ +template <class T> class array; +template <class T> unsigned size(const array <T> &c); + +template <class T> +class array { +private: + T *base; // pointer to storage + unsigned length; // size of array + int *use_count; // reference counter + +public: + +// Constructors + + array (const unsigned n) { + base = new T[length = n]; // allocate storage + memset(base,0,n*sizeof(T)); // clear to zero + use_count = new int; + *use_count = 1; // init use count + } + array (const T *src, const unsigned n) { + base = new T[length = n]; // allocate storage + memmove(base,src, n*sizeof(T)); // copy initial data + use_count = new int; + *use_count = 1; // init use count + } + array(const array<T> &a) { + *this = a; + (*use_count)++; // increment use count + } + array<T> &operator =(const array<T> &a) { + if (--(*use_count) == 0) { + delete [] base; + delete use_count; + } + *this = a; + (*use_count)++; // increment use count + return *this; + } + +// Destructor + ~array() { + if (--(*use_count) == 0) { + delete [] base; + delete use_count; + } + } + +// Access to data + + operator T* () const { // Return pointer to data + return base; + } + + T &operator [](unsigned n) const { // Direct access to data + assert(n < length); + return base[n]; + } + + T &operator [](int n) const { // Direct access to data + assert(n >= 0 && (unsigned) n < length); + return base[n]; + } + + +// Size of array + +#ifdef __IBMCPP__ + friend unsigned size(const array<T> &c); +#else + friend unsigned size<>(const array<T> &c); +#endif + +}; + +template <class T> +inline unsigned size(const array <T> &c) { + return c.length; +} + +#endif