对类型的非常量左值引用...无法绑定到类型的临时对象 [英] non-const lvalue reference to type ... cannot bind to a temporary of type

问题描述

我有这个问题

83:24:错误:类型为'QImage'的非常量左值引用无法绑定到类型为'QImage'的临时目录cameraimplementation.h:23:34:注意:此处将参数传递给参数'nextImage'

83:24: error: non-const lvalue reference to type 'QImage' cannot bind to a temporary of type 'QImage' cameraimplementation.h:23:34: note: passing argument to parameter 'nextImage' here

此代码所致

updateImageData(toQImage());

与

void updateImageData(QImage& nextImage);
QImage toQImage();

除了添加临时变量外，我该如何解决这个问题.

How can I solve this other than including a temporary variable.

QImage image = toQImage();
updateImageData(image);

推荐答案

您不能.

C ++标准不允许匿名临时绑定到引用，尽管某些编译器允许将其作为扩展.(允许绑定到 const 引用 .)

The C++ standard does not allow the binding of an anonymous temporary to a reference, although some compilers allow it as an extension. (Binding to a const reference is allowed.)

除了已经存在的解决方法之外，如果可以将函数更改为采用 const QImage& ，那么效果会更好.

Aside from the workaround you already have, if you can change the function to take const QImage& then that would be better.

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