{"id":377,"date":"2021-07-13T01:22:30","date_gmt":"2021-07-13T01:22:30","guid":{"rendered":"http:\/\/gongyikun.cn\/?p=377"},"modified":"2021-07-14T08:00:12","modified_gmt":"2021-07-14T08:00:12","slug":"qt%e4%b9%8blambda%e8%a1%a8%e8%be%be%e5%bc%8f%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"https:\/\/blog.gongyikun.cn\/?p=377","title":{"rendered":"QT\u4e4bLambda\u8868\u8fbe\u5f0f\u7528\u6cd5"},"content":{"rendered":"

QT\u4e2d\u4fe1\u53f7\u4e0e\u69fd\u5141\u8bb8\u4f7f\u7528\u4efb\u610f\u51fd\u6570\u4f5c\u4e3a\u69fd\u51fd\u6570\uff0c\u4f46\u5982\u679c\u60f3\u8981\u66f4\u597d\u5730\u6267\u884c\u5f02\u6b65\u4ee3\u7801\uff0c\u8fde\u51fd\u6570\u90fd\u4e0d\u60f3\u5b9a\u4e49\uff0cConnect\u5173\u8054\u65f6\u76f4\u63a5\u6307\u5b9a\u4fe1\u53f7\u53d1\u51fa\u65f6\u6267\u884c\u7684\u4ee3\u7801\uff0c\u90a3\u4e48\u5c31\u9700\u8981\u7528\u5230Lambda\u8868\u8fbe\u5f0f\uff0c\u793a\u4f8b\u5982\u4e0b\uff1a<\/h2>\n
connect(dlg,&StringDialog::stringChanged,\n    [=](QString str)\n            {\n                if(str ==  \"qt\")\n                {\n                    ui->stringLabel->settext(\"hello qt\");\n                }\n                else\n                {\n                    ui->stringLabel->settext(\"error\");\n                }\n            });\n<\/code><\/pre>\n
1.\u76f4\u63a5\u5728Connect\u8bed\u53e5\u4e2d\u6dfb\u52a0\u4e86\u4fe1\u53f7\u53d1\u5c04\u540e\u8981\u6267\u884c\u7684\u4ee3\u7801\uff0c\u4f7f\u7528\u53c2\u6570\u503c\u533a\u522b\u663e\u793a\u4e0d\u540c\u7684\u5b57\u7b26\u3002\u8fd9\u79cd\u5199\u6cd5\u5c31\u662f\u6240\u8c13\u7684Lambda\u8868\u8fbe\u5f0f\u3002<\/h4>\n
2.Lambda\u8868\u8fbe\u5f0f\u662fC++11\u65b0\u589e\u52a0\u7684\u7279\u6027\uff0c\u7b80\u5355\u6765\u8bf4Lambda\u8868\u8fbe\u5f0f\u5c31\u662f\u533f\u540d\u51fd\u6570\u3002<\/h4>\n
3.\u5728C++11\u4e2d\uff0c\u5b83\u4ee5\u4e00\u5bf9\u65b9\u62ec\u53f7\u5f00\u59cb\uff0c\u8fd9\u5bf9\u65b9\u62ec\u53f7\u88ab\u79f0\u4e3aLambda\u8868\u8fbe\u5f0f\u7684\u5f15\u5165\u7b26\uff0c\u5f15\u5165\u7b26\u540e\u9762\u53ef\u4ee5\u6dfb\u52a0Lambda\u8868\u8fbe\u5f0f\u7684\u8fd4\u56de\u503c\u7c7b\u578b\uff0c\u4e4b\u540e\u662f\u53c2\u6570\u5217\u8868\uff0c\u6700\u540e\u662fLambda\u8868\u8fbe\u5f0f\u7684\u51fd\u6570\u4f53<\/h4>\n
4.\u4e0d\u540c\u7684Lambda\u8868\u8fbe\u5f0f\u5f15\u5165\u7b26\u6709\u7740\u4e0d\u540c\u7684\u542b\u4e49\uff0c\u5f15\u5165\u7b26\u63cf\u8ff0\u51fd\u6570\u5982\u4f55\u201c\u83b7\u5f97\u201d\u5916\u90e8\u53d8\u91cf\u3002\u8fd9\u4e00\u8fc7\u7a0b\u88ab\u79f0\u4e3a\u201c\u6355\u83b7\u201d\u3002\u6240\u8c13\u7684\u5916\u90e8\u53d8\u91cf\u5c31\u662f\u6307\u51fd\u6570\u4f53\u4ee5\u5916\u7684\u53d8\u91cf\uff0c\u8fd9\u4e9b\u53d8\u91cf\u9700\u8981\u5728\u5f15\u5165\u7b26\u53ef\u89c1\u7684\u4f5c\u7528\u57df\u6709\u5b9a\u4e49<\/h4>\n
\n
Lambda\u8868\u8fbe\u5f0f\u5f15\u5165\u7b26<\/h5>\n\n\n\n\n\n\n\n\n\n\n
\u5f15\u5165\u7b26<\/th>\n\u8bf4\u660e<\/th>\n<\/tr>\n<\/thead>\n
[  ]<\/td>\n\u4e0d\u6355\u83b7\u4efb\u4f55\u5916\u90e8\u53d8\u91cf<\/td>\n<\/tr>\n
[=]<\/td>\n\u4ee5\u4f20\u503c\u7684\u65b9\u5f0f\u6355\u83b7\u5916\u90e8\u6240\u6709\u7684\u5916\u90e8\u53d8\u91cf<\/td>\n<\/tr>\n
[&]<\/td>\n\u4ee5\u5f15\u7528\u7684\u65b9\u5f0f\u6355\u83b7\u5916\u90e8\u6240\u6709\u53d8\u91cf<\/td>\n<\/tr>\n
[x,&y]<\/td>\nx\u4f20\u503c\u7684\u65b9\u5f0f\uff0cy\u4ee5\u4f20\u5f15\u7528\u7684\u65b9\u5f0f\u6355\u83b7<\/td>\n<\/tr>\n
[=,&x]<\/td>\nx\u4ee5\u4f20\u5f15\u7528\u7684\u65b9\u5f0f,\u5176\u4f59\u5916\u90e8\u53d8\u91cf\u5219\u4ee5\u4f20\u503c\u7684\u65b9\u5f0f\u6355\u83b7<\/td>\n<\/tr>\n
[&,x]<\/td>\nx\u4ee5\u4f20\u503c\u7684\u65b9\u5f0f\u6355\u83b7\uff0c\u5176\u4f59\u5916\u90e8\u53d8\u91cf\u5219\u4ee5\u4f20\u5f15\u7528\u7684\u65b9\u5f0f\u6355\u83b7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u4f8b\u5982\u4e00\u4e2aLambda\u8868\u8fbe\u5f0f\u9700\u8981\u4e24\u4e2a\u53c2\u6570\uff0c\u4ee5\u4f20\u503c\u7684\u65b9\u5f0f\u6355\u83b7a\u548c\u4ee5\u4f20\u5f15\u7528\u7684\u65b9\u5f0f\u6355\u83b7\u7684str,\u5176\u8fd4\u56de\u503c\u662fQString\u7c7b\u578b\uff0c\u90a3\u4e48\u8fd9\u4e2aLambda\u8868\u8fbe\u5f0f\u5e94\u8be5\u5199\u6210:<\/h4>\n
connect(dlg,&StringDialog::stringChanged,[a,&str]->QString<\/h4>\n
{<\/h4>\n
});<\/h4>\n
<\/div>","protected":false},"excerpt":{"rendered":"
QT\u4e2d\u4fe1\u53f7\u4e0e\u69fd\u5141\u8bb8\u4f7f\u7528\u4efb\u610f\u51fd\u6570\u4f5c\u4e3a\u69fd\u51fd\u6570\uff0c\u4f46\u5982\u679c\u60f3\u8981\u66f4\u597d\u5730\u6267\u884c\u5f02\u6b65\u4ee3\u7801\uff0c\u8fde\u51fd\u6570\u90fd\u4e0d\u60f3\u5b9a\u4e49\uff0cConnect\u5173\u8054\u65f6 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[21],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.gongyikun.cn\/index.php?rest_route=\/wp\/v2\/posts\/377"}],"collection":[{"href":"https:\/\/blog.gongyikun.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.gongyikun.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.gongyikun.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.gongyikun.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=377"}],"version-history":[{"count":12,"href":"https:\/\/blog.gongyikun.cn\/index.php?rest_route=\/wp\/v2\/posts\/377\/revisions"}],"predecessor-version":[{"id":427,"href":"https:\/\/blog.gongyikun.cn\/index.php?rest_route=\/wp\/v2\/posts\/377\/revisions\/427"}],"wp:attachment":[{"href":"https:\/\/blog.gongyikun.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=377"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.gongyikun.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=377"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.gongyikun.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=377"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}