{"id":26,"date":"2009-03-22T16:23:48","date_gmt":"2009-03-22T08:23:48","guid":{"rendered":"http:\/\/www.genepeng.com\/?p=26"},"modified":"2009-03-22T16:25:15","modified_gmt":"2009-03-22T08:25:15","slug":"%e5%bc%95%e7%94%a8%e4%b8%8e%e6%8c%87%e9%92%88%e7%9a%84%e6%af%94%e8%be%83","status":"publish","type":"post","link":"https:\/\/www.genepeng.com\/index.php\/26","title":{"rendered":"\u5f15\u7528\u4e0e\u6307\u9488\u7684\u6bd4\u8f83"},"content":{"rendered":"<p>\u5f15\u7528\u548c\u6307\u9488\u7684\u533a\u522b\u5728\u4e8e\u4e0b\u9762\u51e0\u70b9\uff1a<\/p>\n<p>\uff11.  \u521b\u5efa\u5f15\u7528\u65f6\u5fc5\u987b\u521d\u59cb\u5316\uff0c\u800c\u4e14\u4e0d\u80fd\u521d\u59cb\u5316\u4e3anull; \u3000\u800c\u6307\u9488\u53ef\u4ee5\u4e0d\u521d\u59cb\u5316\uff0c\u4e5f\u53ef\u4ee5\u521d\u59cb\u5316\u4e3anull<\/p>\n<p><span style=\"color: #993300;\">int &amp;a;\u3000\/\/error, references must be initialized<br \/>\nint *p;    \/\/right<br \/>\nint &amp;a = NULL;  \/\/error, can&#8217;t init as NULL<br \/>\nint *p = NULL; \/\/right<\/span><\/p>\n<p><span style=\"color: #000000;\">2. \u5f15\u7528\u521d\u59cb\u5316\u540e\uff0c\u5c31\u4e0d\u518d\u6539\u53d8;\u3000\u800c\u6307\u9488\u968f\u65f6\u53ef\u4ee5\u6539\u53d8\u6240\u6307\u7684\u5bf9\u8c61\u3002<\/span><\/p>\n<p><span style=\"color: #993300;\">int a = 1;<br \/>\nint b = 2;<br \/>\nint &amp;r = a;\u3000\/\/r\u6210\u4e3aa\u7684\u5f15\u7528\uff0c\u5373\u522b\u540d\uff0cr\u6052\u4e3aa \u7684\u5f15\u7528\uff0c\u4e0d\u53ef\u6539\u53d8<br \/>\nr = b;\/\/\u6b64\u65f6\u4e0d\u8981\u4ee5\u4e3ar\u53d8\u6210\u4e86b\u7684\u5f15\u7528\uff0c\u800c\u662f\u628ab\u7684\u503c\u8d4b\u7ed9\u4e86a, \u6b64\u662fa, r \u90fd\u4e3ab\u7684\u503c\uff12<br \/>\nr = 3;\/\/a, r\u7684\u503c\u90fd\u53d8\u6210\u4e86\uff13\uff0cb\u7684\u503c\u4e0d\u53d8\uff0c\u4ecd\u4e3a\uff12<\/span><\/p>\n<p><span style=\"color: #000000;\">\u6307\u9488\u5374\u662f\u53ef\u4ee5\u968f\u65f6\u6539\u53d8\u6240\u6307\u7684\u5bf9\u8c61<\/span><\/p>\n<p><span style=\"color: #993300;\">int a = 1;<br \/>\nint b = 2;<br \/>\nint *p = &amp;a; \/\/ *p == 1\uff0c\u3000p\u521d\u59cb\u5316\u6210\u4e86a\u7684\u5730\u5740\u503c<br \/>\np = &amp;b;  \/\/ *p == 2\uff0cp\u5730\u5740\u503c\u53d8\u4e86\uff0cp\u53d8\u6210\u4e86b\u7684\u5730\u5740\u503c<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f15\u7528\u548c\u6307\u9488\u7684\u533a\u522b\u5728\u4e8e\u4e0b\u9762\u51e0\u70b9\uff1a \uff11. \u521b\u5efa\u5f15\u7528\u65f6\u5fc5\u987b\u521d\u59cb\u5316\uff0c\u800c\u4e14\u4e0d\u80fd\u521d\u59cb\u5316\u4e3anull; \u3000\u800c\u6307\u9488\u53ef\u4ee5\u4e0d\u521d\u59cb\u5316\uff0c\u4e5f\u53ef\u4ee5\u521d\u59cb\u5316\u4e3anull int &amp;a;\u3000\/\/error, references must be initialized int *p; \/\/right int &amp;a = NULL; \/\/error, can&#8217;t init as NULL int *p = NULL; \/\/right 2. \u5f15\u7528\u521d\u59cb\u5316\u540e\uff0c\u5c31\u4e0d\u518d\u6539\u53d8;\u3000\u800c\u6307\u9488\u968f\u65f6\u53ef\u4ee5\u6539\u53d8\u6240\u6307\u7684\u5bf9\u8c61\u3002 int a = 1; int b = 2; int &amp;r = a;\u3000\/\/r\u6210\u4e3aa\u7684\u5f15\u7528\uff0c\u5373\u522b\u540d\uff0cr\u6052\u4e3aa \u7684\u5f15\u7528\uff0c\u4e0d\u53ef\u6539\u53d8 r = b;\/\/\u6b64\u65f6\u4e0d\u8981\u4ee5\u4e3ar\u53d8\u6210\u4e86b\u7684\u5f15\u7528\uff0c\u800c\u662f\u628ab\u7684\u503c\u8d4b\u7ed9\u4e86a, \u6b64\u662fa, r \u90fd\u4e3ab\u7684\u503c\uff12 r = 3;\/\/a, r\u7684\u503c\u90fd\u53d8\u6210\u4e86\uff13\uff0cb\u7684\u503c\u4e0d\u53d8\uff0c\u4ecd\u4e3a\uff12 \u6307\u9488\u5374\u662f\u53ef\u4ee5\u968f\u65f6\u6539\u53d8\u6240\u6307\u7684\u5bf9\u8c61 int a &#8230; <a title=\"\u5f15\u7528\u4e0e\u6307\u9488\u7684\u6bd4\u8f83\" class=\"read-more\" href=\"https:\/\/www.genepeng.com\/index.php\/26\" aria-label=\"More on \u5f15\u7528\u4e0e\u6307\u9488\u7684\u6bd4\u8f83\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[5,3],"tags":[22,21],"_links":{"self":[{"href":"https:\/\/www.genepeng.com\/index.php\/wp-json\/wp\/v2\/posts\/26"}],"collection":[{"href":"https:\/\/www.genepeng.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.genepeng.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.genepeng.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.genepeng.com\/index.php\/wp-json\/wp\/v2\/comments?post=26"}],"version-history":[{"count":3,"href":"https:\/\/www.genepeng.com\/index.php\/wp-json\/wp\/v2\/posts\/26\/revisions"}],"predecessor-version":[{"id":28,"href":"https:\/\/www.genepeng.com\/index.php\/wp-json\/wp\/v2\/posts\/26\/revisions\/28"}],"wp:attachment":[{"href":"https:\/\/www.genepeng.com\/index.php\/wp-json\/wp\/v2\/media?parent=26"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.genepeng.com\/index.php\/wp-json\/wp\/v2\/categories?post=26"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.genepeng.com\/index.php\/wp-json\/wp\/v2\/tags?post=26"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}