{"id":1464,"date":"2018-12-17T15:54:39","date_gmt":"2018-12-17T07:54:39","guid":{"rendered":"http:\/\/www.yusian.com\/blog\/?p=1464"},"modified":"2018-12-17T15:54:39","modified_gmt":"2018-12-17T07:54:39","slug":"%e5%85%b3%e4%ba%8econst%e7%9a%84%e5%87%a0%e7%a7%8d%e9%9d%9e%e5%b8%b8%e8%a7%81%e5%ba%94%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.yusian.com\/blog\/cpp\/2018\/12\/17\/1554391464.html","title":{"rendered":"\u5173\u4e8econst\u7684\u51e0\u79cd\u975e\u5e38\u89c1\u5e94\u7528"},"content":{"rendered":"<p>1\u3001\u4fee\u9970\u6307\u9488\u53d8\u91cf\u7684\u51e0\u79cd\u60c5\u51b5<\/p>\n\n\n<pre lang=\"objc\" line=\"1\">\t\n\/\/ 0\u3001\u6b63\u5e38\u6307\u9488\uff0c\u53ef\u4ee5\u7ed9p\u8d4b\u503c\uff0c\u4e5f\u53ef\u4ee5\u7ed9*p\u8d4b\u503c\nint *p = &a;\n\n\/\/ 1\u3001const\u4fee\u9970*p\uff0c\u53ef\u4ee5\u7ed9p\u8d4b\u503c\uff0c\u4e0d\u53ef\u80fd\u7ed9*p\u8d4b\u503c\nint const *p = &a;\nconst int *p = &a; const\u4e0eint\u4f4d\u7f6e\u4e92\u6362\u662f\u7b49\u4ef7\u7684\np = &b;\n*p = 20;\/\/ \u7f16\u8bd1\u62a5\u9519\n\n\/\/ 2\u3001const\u4fee\u9970p\uff0c\u4e0d\u53ef\u4ee5\u7ed9p\u8d4b\u503c\uff0c\u53ef\u4ee5\u7ed9*p\u8d4b\u503c\nint * const p = &a;\np = &b;\t\/\/ \u7f16\u8bd1\u62a5\u9519\n*p = 20;\n\n\/\/ 3\u3001const\u4fee\u9970*p\uff0c const\u4fee\u9970p\uff0cp\u4e0e*p\u90fd\u4e0d\u53ef\u4ee5\u8d4b\u503c\nint const * const p = &a;\nconst int * const p = &a;\/\/\u4e0e\u4e0a\u4e00\u884c\u7b49\u4ef7\np = &b;\t\/\/ \u62a5\u9519\n*p = 20;\t\/\/ \u62a5\u9519<\/pre>\n\n\n<p>2\u3001\u4fee\u9970\u4e0d\u540c\u7c7b\u578b\u7684\u5f15\u7528<\/p>\n\n\n<pre lang=\"objc\" line=\"1\">long a = 10;\n\/\/  \u4e0d\u540c\u7c7b\u578b\u7684\u5f15\u7528\uff0c\u7f16\u8bd1\u4e0d\u901a\u8fc7\n\/\/ int &r = a;\n\/\/ \u52a0const\u4fee\u9970\uff0c\u7f16\u8bd1\u901a\u8fc7\nint const &r = a;\n\/\/ const\u4fee\u9970\u7684\u5f15\u7528\uff0c\u88ab\u5f53\u505a\u5e38\u91cf\u4fdd\u5b58\na = 20;\n\/\/ \u4fee\u6539\u539f\u503c\u540e\uff0cr\u7684\u503c\u4e0d\u53d8\uff0c\u8fd8\u662f\u5f15\u7528\u65f6\u7684\u503c\uff0cr\u8f93\u51fa\u4e3a10\ncout << r << endl;<\/pre>\n\n\n<p>3\u3001\u4fee\u9970\u6570\u7ec4\u7684\u5f15\u7528<\/p>\n\n\n<pre lang=\"objc\" line=\"1\">\n\/\/ \u5b9a\u4e49\u6570\u7ec4\u53d8\u91cf\nint array[] = { 1, 2, 3, 4 };\n\n\/\/ \u4e0d\u52a0\u62ec\u53f7\u5219\u8868\u793a\u6307\u9488\u6570\u7ec4\uff0c\u800c\u975e\u6307\u5411\u6570\u7ec4\u7684\u6307\u9488\nint (*p_array)[4] = &array;\n\/\/ \u7c7b\u4f3c\u6307\u9488\uff0c\u4e0d\u52a0\u62ec\u53f7\u5219\u8868\u793a\u4e3a\u5f15\u7528\u6570\u7ec4\uff0c\u800c\u975e\u6570\u7ec4\u5f15\u7528\nint (&r_array)[4] = array;\n\/\/ \u5f15\u7528\u4e0e\u6307\u9488\u90fd\u8981\u8868\u660e\u6307\u5411\u6216\u5f15\u7528\u7684\u6570\u7ec4\u957f\u5ea6\uff0c\u4e0d\u7075\u6d3b\n\/\/ \u6570\u7ec4\u672c\u8eab\u53ef\u4ee5\u7528\u6307\u9488\u6765\u8868\u793a\nint *p = array;\n\/\/ \u6307\u9488\u7684\u5f15\u7528\u5219\u5f88\u597d\u8868\u793a\uff0c\u8fd9\u6837\u4e00\u6765rp\u5219\u8868\u793a\u6570\u7ec4\u7684\u5f15\u7528\nint *&rp = p;\n\/\/ \u8df3\u8fc7\u4e2d\u95f4p\u7684\u8f6c\u6362\uff0c\u76f4\u63a5\u5f15\u7528\u4f1a\u600e\u6837\uff1f\u56e0\u4e3a\u7c7b\u578b\u4e0d\u5339\u914d\u800c\u62a5\u9519\n\/\/ \u52a0const\u4fee\u9970\u5f15\u7528\uff0c\u5219\u662f\u88ab\u5141\u8bb8\u7684\nint * const &rp1 = array;<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>1\u3001\u4fee\u9970\u6307\u9488\u53d8\u91cf\u7684\u51e0\u79cd\u60c5\u51b5 2\u3001\u4fee\u9970\u4e0d\u540c\u7c7b\u578b\u7684\u5f15\u7528 3\u3001\u4fee\u9970\u6570\u7ec4\u7684\u5f15\u7528<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[88],"tags":[206,205],"class_list":["post-1464","post","type-post","status-publish","format-standard","hentry","category-cpp","tag-const","tag-205"],"_links":{"self":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts\/1464","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/comments?post=1464"}],"version-history":[{"count":0,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts\/1464\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/media?parent=1464"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/categories?post=1464"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/tags?post=1464"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}