{"id":275,"date":"2010-06-05T17:57:00","date_gmt":"2010-06-05T09:57:00","guid":{"rendered":"http:\/\/localhost\/?p=275"},"modified":"2010-06-05T17:57:00","modified_gmt":"2010-06-05T09:57:00","slug":"c___inside_the_little_tricks_","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/wjmzbmr\/?p=275","title":{"rendered":"C++\u91cc\u9762\u4e00\u70b9\u5c0f\u6280\u5de7\u3002\u3002\u3002"},"content":{"rendered":"\n

\u989d\u3002\u3002\u795e\u725b\u522b\u9a82\u6211\u706b\u661f\u989d\u56e7\u3002\u3002\u53ea\u662f\u6700\u8fd1\u770b\u5230\u4e00\u4e9bC++\u4e2d\u6bd4\u8f83\u795e\u5947\u7684\u4e1c\u897f\u3002\u3002\u3002
#define
\u5176\u5b9edefine\u7684\u4f5c\u7528\u5927\u5f97\u60ca\u4eba\u3002\u3002\u53ef\u4ee5\u5927\u5927\u7b80\u5316\u4ee3\u7801\u751a\u81f3\u4ee3\u66fftemplate
1. #x
\u5148\u770b\u4e0b\u8fd9\u4e2a\u4ee3\u7801
#define Debug(x) cout<<#x<<"="<<(x)<<endl;
int i=5;Debug(i);
\u53ef\u80fd\u4f60\u4e0d\u77e5\u9053#x\u662f\u4ec0\u4e48\u610f\u601d\uff0c\u4e0d\u8fc7\u8fd0\u884c\u4e00\u4e0b\u554a\u5c31\u4f1a\u53d1\u73b0\u7ed3\u679c\u662fi=5\u8bf4\u660e#x\u5c31\u662f\u5e26\u8fdb\u53bb\u7684\u8fd9\u4e2a\u4e1c\u897f\u7684\u5b57\u7b26\u4e32\u5f62\u5f0f\u3002\u3002\u8fd0\u7528\u8fd9\u4e2a\u5f62\u5f0f\uff0c\u53ef\u4ee5\u65b9\u4fbf\u7684\u505a\u4e00\u4e2a\u50cf\u4e0a\u9762\u90a3\u4e2a\u90a3\u4e2aDebug\u7684\u51fd\u6570\uff0c\u50cf\u6211\u8fd9\u6837\u4ece\u6765\u4e0d\u8c03\u8bd5\u7684NC\u6765\u8bf4\uff0c\u771f\u662f\u798f\u97f3\u554a\u3002\u3002
2.##x
\u4e00\u6837\uff0c\u5148\u770b\u4e0b\u8fd9\u4e2a\u4ee3\u7801
#define D(x) m##x
int D(x)=0;cout<<m1<<endl;
\u7ed3\u679c\u80fd\u8f93\u51fa\u5e76\u4e14\u5c31\u662f0.\u3002
\u4e5f\u5c31\u662f\u8bf4##x\u5c31\u662f\u628a\u5b83\u770b\u6210\u539f\u6765\u7684\u4e00\u6bb5\u5b57\u7b26\uff08\u4e0d\u662f\u5b57\u7b26\u4e32\uff09\u63a5\u5728\u540e\u9762\u3002\u3002
\u8fd0\u7528\u8fd9\u4e2a\u53ef\u4ee5\u5f88\u65b9\u4fbf\u7684\u58f0\u660e\u548c\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\u3002\u3002\u3002
#define D(x) int m##x=0
D(0);D(1);D(2);D(3);D(4);D(5);D(6);D(7);
3.\u591a\u884c
#define\u662f\u53ef\u4ee5\u591a\u884c\u7684\u3002\u53ea\u8981\u5728\u9664\u4e86\u6700\u540e\u4e00\u884c\u7684\u6bcf\u4e00\u884c\u540e\u9762\u52a0\u4e00\u4e2a\u5c31\u53ef\u4ee5\u4e86\u3002\u3002
\u6bd4\u5982
#define Swap(T,x,y)
{
    T tmp=x;x=y;y=tmp;
}
int a=0,b=1;Swap(int,a,b);Debug(a);Debug(b);
\u8fd9\u6837\u5c31\u53ef\u4ee5\u751a\u81f3\u62ff\u6765\u4ee3\u66fftemplate\u3002\u3002\u8fd9\u79cd\u4e1c\u897f\u5728\u67d0\u4e9b\u5927\u91cf\u4f7f\u7528\u7684\u4ee3\u7801\u6bb5\u4e2d\u53ef\u4ee5\u5927\u5927\u65b9\u4fbfCoder
\u8fd8\u6709\u4e00\u4e9b\u5f88\u5f3a\u5927\u7684\u7b26\u53f7
a<?b <=> min(a,b)
a>?b <=>max(a,b)
a<?=b <=> a=min(a,b)
a>?=b <=> a=max(a,b)
\u53e6\u5916\u6211\u5feb\u88abJava\u641e\u6b7b\u4e86\u3002\u3002\u8fd9\u73a9\u610f\u592a\u7cbe\u7ec6\u4e86\u3002\u3002\u5199\u8d77\u6765\u7d2f\u6b7b\u4eba\u3002\u3002\u3002\u665a\u4e0a\u5c31\u8981\u6709TopCoder\u6bd4\u8d5b\u4e86\u3002\u3002\u6211\u8fd8\u662f\u7528C++\u7b97\u4e86\u3002\u3002.
\u6700\u8be1\u5f02\u7684\u662falgorithm\u8fd9\u4e2a\u5e93\u5c45\u7136\u80fd\u591f\u52a0\u5feb\u7a0b\u5e8f\u7684\u901f\u5ea6\uff1f\uff1f\uff1f\uff1f\uff1f\u89c1\u9b3c\u554a\u3002\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u989d\u3002\u3002\u795e\u725b\u522b\u9a82\u6211\u706b\u661f\u989d\u56e7\u3002\u3002\u53ea\u662f\u6700\u8fd1\u770b\u5230\u4e00\u4e9bC++\u4e2d\u6bd4\u8f83\u795e\u5947\u7684\u4e1c\u897f\u3002\u3002\u3002#define\u5176\u5b9edefine\u7684\u4f5c\u7528\u5927\u5f97\u60ca\u4eba\u3002\u3002\u53ef\u4ee5\u5927\u5927\u7b80\u5316\u4ee3\u7801\u751a\u81f3\u4ee3\u66fftemplate1. #x\u5148\u770b\u4e0b\u8fd9\u4e2a\u4ee3\u7801#define Debug(x) cout<<#x<<"="<<(x)<<endl; int i=5;Debug(i);\u53ef\u80fd\u4f60\u4e0d\u77e5\u9053#x\u662f\u4ec0\u4e48\u610f\u601d\uff0c\u4e0d\u8fc7\u8fd0\u884c\u4e00\u4e0b\u554a\u5c31\u4f1a\u53d1\u73b0\u7ed3\u679c\u662fi=5\u8bf4\u660e#x\u5c31\u662f\u5e26\u8fdb\u53bb\u7684\u8fd9\u4e2a\u4e1c\u897f\u7684\u5b57\u7b26\u4e32\u5f62\u5f0f\u3002\u3002\u8fd0\u7528\u8fd9\u4e2a\u5f62\u5f0f\uff0c\u53ef\u4ee5\u65b9\u4fbf\u7684\u505a\u4e00\u4e2a\u50cf\u4e0a\u9762\u90a3\u4e2a\u90a3\u4e2aDebug\u7684\u51fd\u6570\uff0c\u50cf\u6211\u8fd9\u6837\u4ece\u6765\u4e0d\u8c03\u8bd5\u7684NC\u6765\u8bf4\uff0c\u771f\u662f\u798f\u97f3\u554a\u3002\u30022.##x\u4e00\u6837\uff0c\u5148\u770b\u4e0b\u8fd9\u4e2a\u4ee3\u7801#define D(x) m##xint D(x)=0;cout<<m1<<endl;\u7ed3\u679c\u80fd\u8f93\u51fa\u5e76\u4e14\u5c31\u662f0.\u3002\u4e5f\u5c31\u662f\u8bf4##x\u5c31\u662f\u628a\u5b83\u770b\u6210\u539f\u6765\u7684\u4e00\u6bb5\u5b57\u7b26\uff08\u4e0d\u662f\u5b57\u7b26\u4e32\uff09\u63a5\u5728\u540e\u9762\u3002\u3002\u8fd0\u7528\u8fd9\u4e2a\u53ef\u4ee5\u5f88\u65b9\u4fbf\u7684\u58f0\u660e\u548c\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\u3002\u3002\u3002#define D(x) int m##x=0D(0);D(1);D(2);D(3);D(4);D(5);D(6);D(7);3.\u591a\u884c#define\u662f\u53ef\u4ee5\u591a\u884c\u7684\u3002\u53ea\u8981\u5728\u9664\u4e86\u6700\u540e\u4e00\u884c\u7684\u6bcf\u4e00\u884c\u540e\u9762\u52a0\u4e00\u4e2a\u5c31\u53ef\u4ee5\u4e86\u3002\u3002\u6bd4\u5982#define Swap(T,x,y){    T tmp=x;x=y;y=tmp;}int a=0,b=1;Swap(int,a,b);Debug(a);Debug(b);\u8fd9\u6837\u5c31\u53ef\u4ee5\u751a\u81f3\u62ff\u6765\u4ee3\u66fftemplate\u3002\u3002\u8fd9\u79cd\u4e1c\u897f\u5728\u67d0\u4e9b\u5927\u91cf\u4f7f\u7528\u7684\u4ee3\u7801\u6bb5\u4e2d\u53ef\u4ee5\u5927\u5927\u65b9\u4fbfCoder\u8fd8\u6709\u4e00\u4e9b\u5f88\u5f3a\u5927\u7684\u7b26\u53f7a<?b <=> min(a,b)a>?b <=>max(a,b)a<?=b <=> a=min(a,b)a>?=b <=> a=max(a,b)\u53e6\u5916\u6211\u5feb\u88abJava\u641e\u6b7b\u4e86\u3002\u3002\u8fd9\u73a9\u610f\u592a\u7cbe\u7ec6\u4e86\u3002\u3002\u5199\u8d77\u6765\u7d2f\u6b7b\u4eba\u3002\u3002\u3002\u665a\u4e0a\u5c31\u8981\u6709TopCoder\u6bd4\u8d5b\u4e86\u3002\u3002\u6211\u8fd8\u662f\u7528C++\u7b97\u4e86\u3002\u3002.\u6700\u8be1\u5f02\u7684\u662falgorithm\u8fd9\u4e2a\u5e93\u5c45\u7136\u80fd\u591f\u52a0\u5feb\u7a0b\u5e8f\u7684\u901f\u5ea6\uff1f\uff1f\uff1f\uff1f\uff1f\u89c1\u9b3c\u554a\u3002\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[10],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/posts\/275"}],"collection":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=275"}],"version-history":[{"count":0,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/posts\/275\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=275"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=275"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=275"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}