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通过值捕获（或 const 引用捕获）传进 lambda，会默认复制成 const。

背景

匿名函数外部定义 QSet<QString> nameSet,需要传入匿名函数使用修改

connect(dlg, ..., [nameSet](...) {nameSet.insert(name); // ❌ 这里其实是 const QSet<QString>
});

所以报错:

XXX.cpp:604:33: No matching member function for call to 'insert'
qset.h:155:21: candidate function not viable: 'this' argument has type 'const QSet<QString>', but method is not marked const
qset.h:157:21: candidate function not viable: 'this' argument has type 'const QSet<QString>', but method is not marked const
qset.h:179:14: candidate function not viable: requires 2 arguments, but 1 was provided

解决：

使用引用&捕获

connect(dlg, ..., [&nameSet](...) {});