{"id":250,"date":"2007-06-13T14:00:00","date_gmt":"2007-06-13T06:00:00","guid":{"rendered":"http:\/\/www.freemindworld.com\/blog\/permalink\/?id=20070613"},"modified":"2012-01-30T13:53:18","modified_gmt":"2012-01-30T05:53:18","slug":"070613_cpp_two_dimension_array","status":"publish","type":"post","link":"https:\/\/www.freemindworld.com\/blog\/2007\/070613_cpp_two_dimension_array.shtml","title":{"rendered":"\u5982\u4f55\u5728C++\u4e2d\u52a8\u6001\u5206\u914d\u4e8c\u7ef4\u6570\u7ec4-\u7eed"},"content":{"rendered":"

\u56de\u5934\u770b\u4e00\u4e0b\u524d\u4e00\u7bc7\u300a\u5982\u4f55\u5728C++\u4e2d\u52a8\u6001\u5206\u914d\u4e8c\u7ef4\u6570\u7ec4<\/a>\u300b\u624d\u53d1\u73b0\u5b83\u662f\u6302\u7f8a\u5934\u5356\u72d7\u8089\uff0c\u6587\u4e2d\u53ea\u63d0\u4e86\u4eceChinaUnix\u4e0a\u62ff\u6765\u7684\u90a3\u4e2aC\u7684\u5b9e\u73b0\uff0c\u8fd8\u662f\u6ca1\u6709\u7ed3\u8bba\u8bf4\u5bf9\u4e8eC++\u7684\u5bf9\u8c61\u5e94\u8be5\u600e\u4e48\u5904\u7406\u3002\u4eca\u5929\u62bd\u7a7a\u5199\u4e86\u4e00\u4e0b\u3002<\/p>\n

\u5173\u952e\u70b9\u8fd8\u662f\u5728\u4e8eplacement new\u548c\u663e\u793a\u7684\u6790\u6784\u51fd\u6570\u8c03\u7528\uff0c\u7528\u4e8e\u4fdd\u8bc1\u5bf9\u8c61\u53ef\u4ee5\u6b63\u5e38\u7684\u6784\u9020\u548c\u6790\u6784\u3002<\/p>\n

\u4e0d\u8fc7\u8fd9\u4e2a\u5b9e\u73b0\u4e5f\u8fd8\u662f\u6709\u4e0d\u5c11\u7f3a\u70b9\u7684\uff0c\u6bd4\u5982\uff0c\u6570\u7ec4\u7684\u5927\u5c0f\u5fc5\u987b\u8bb0\u4f4f\uff0c\u624d\u80fd\u4fdd\u8bc1\u6790\u6784\u6240\u6709\u5bf9\u8c61\u3002\u4e0d\u8fc7\u8fd9\u70b9\u53ef\u4ee5\u901a\u8fc7\u6539\u8fdb\u5206\u914d\u65b9\u6cd5\u7b97\u6cd5\uff0c\u628a\u6570\u7ec4\u5927\u5c0f\u4e5f\u7528\u4e00\u70b9\u7a7a\u95f4\u4fdd\u5b58\u8d77\u6765\u3002<\/p>\n

\u53e6\u4e00\u4e2a\u7f3a\u70b9\u662f\uff0c\u4ece\u8bed\u6cd5\u4e0a\u770b\uff0c\u5f88\u5bb9\u6613\u8ba9\u4eba\u8bef\u628adarray_new\u8fd4\u56de\u7684\u6307\u9488\u4ee5\u4e3a\u662f\u6570\u636e\u533a\u7684\u8d77\u59cb\u5730\u5740\uff0c\u4ece\u800c\u53ef\u80fd\u5bfc\u81f4\u4e00\u4e9b\u903b\u8f91\u9519\u8bef\u3002<\/p>\n

\u5176\u5b9e\u6b63\u50cfftofficer\u5728\u524d\u4e00\u7bc7\u6587\u7ae0\u7684\u7559\u8a00\u4e2d\u8bf4\u7684\u90a3\u6837\uff0c\u6700\u597d\u7684\u529e\u6cd5\u8fd8\u662f\u4e0d\u8981\u201c\u9020\u8f6e\u5b50\u201d\u4e86\uff0c\u6709\u5f3a\u5927\u7684Boost\u653e\u5728\u90a3\u91cc\u4e0d\u7528\u5b9e\u5728\u662f\u592a\u6d6a\u8d39\u4e86\u2026\u2026<\/p>\n

#include <iostream>
\n#include <cstdlib>
\n#include <new>
\ntemplate <typename T>
\nT **darray_new(int row, int col)
\n{
\n int size = sizeof(T);
\n void **arr = (void **) malloc(sizeof(void *) * row + size * row * col);
\n if (arr != NULL)
\n {
\n unsigned char * head;
\n head = (unsigned char *) arr + sizeof(void *) * row;
\n for (int i = 0; i < row; ++i)
\n {
\n arr[i] = head + size * i * col;
\n for (int j = 0; j < col; ++j)
\n new (head + size * (i * col + j)) T;
\n }
\n }
\n return (T**) arr;
\n}
\ntemplate <typename T>
\nvoid darray_free(T **arr, int row, int col)
\n{
\n for (int i = 0; i < row; ++i)
\n for (int j = 0; j < col; ++j)
\n arr[i][j].~T();
\n if (arr != NULL)
\n free((void **)arr);
\n}<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"

\u56de\u5934\u770b\u4e00\u4e0b\u524d\u4e00\u7bc7\u300a\u5982\u4f55\u5728C++\u4e2d\u52a8\u6001\u5206\u914d\u4e8c\u7ef4\u6570\u7ec4\u300b\u624d\u53d1\u73b0\u5b83\u662f\u6302\u7f8a\u5934\u5356\u72d7\u8089\uff0c\u6587\u4e2d\u53ea … \u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-250","post","type-post","status-publish","format-standard","hentry","category-11"],"_links":{"self":[{"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/posts\/250","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/comments?post=250"}],"version-history":[{"count":0,"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/posts\/250\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/media?parent=250"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/categories?post=250"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/tags?post=250"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}