error:'this'cannotbeimplicitlycapturedinthiscontext 1. 纠其原因,在于我在lambda表达式中使用了某个成员变量,但是没有捕获this 把代码 [](){} 1. 加上this就可以了 [this](){} 1.
此行为是设计使然。但是为什么要删除复制构造函数(以及赋值运算符)？如果您仍要复制该怎么办？
This operation takes constant time, because QString is implicitly shared. This makes returning a QString from a function very fast. If a shared instance is modified, it will be copied (copy-on-write), and that takes linear time. See also operator=(). QString::QString(QString &&other) ...
We would like to validate the input with this regular expression while the user is typing it, so that we can report an error in the input as soon as it is committed (for instance, the user typed the wrong key). In order to do so we must distinguish three cases: the input cannot po...
-Warc-maybe-repeated-use-of-weak "weak %select{variable|property|implicit property|instance variable}0 %1 may be accessed multiple times in this %select{function|method|block|lambda}2 and may be unpredictably set to nil assign to a strong variable to keep the object alive ...
: QMainWindow(parent) , ui(new Ui::MainWindow) { ui->setupUi(this);// 1. 创建两个类的实例Commander commander; Soldier soldier;// 2. 建立信号和槽的连接connect(&commander, SIGNAL(go()), &soldier, SLOT(fight()));// 3. 发送信号// emit 可省略...
ubuntu下qt运行报错 /usr/bin/ld: cannot find -lGL,问题描述在Ubuntu下运行Qt程序报错:/usr/bin/ld:cannotfind-lGLcollect2:error:ldreturned1exitstatus解决方案需要安装gl库:执行以下命令sudoapt-getinstalllibgl1-mesa-dev
This operation takes constant time, because QString is implicitly shared. This makes returning a QString from a function very fast. If a shared instance is modified, it will be copied (copy-on-write), and that takes linear time.See also operator=()....
By default QRegExp uses full regexps but this can be changed with setWildcard(). Searching can be forward with search() or backward with searchRev(). Captured text can be accessed using capturedTexts() which returns a string list of all captured strings, or using cap() which returns the ...
We would like to validate the input with this regular expression while the user is typing it, so that we can report an error in the input as soon as it is committed (for instance, the user typed the wrong key). In order to do so we must distinguish three cases: the input cannot po...