[英]c++: allocating a variable inside a if
I am working on some function, this function, depending on some parameters, might need a Model
object. 我正在研究一些函数,这个函数,根据一些参数,可能需要一个Model
对象。 Model
objects are quite big and I don't want to allocate one when not needed. Model
对象非常大,我不想在不需要时分配一个。 Here is, in essence, what I want to do: 从本质上讲,这就是我想要做的事情:
Model *myModel;
if (modelIsNeeded(arguments)) {
myModel = &Model(arguments);
}
//processing ...
I have the error error: taking address of temporary [-fpermissive]
我有错误error: taking address of temporary [-fpermissive]
Do you see any workaround? 你看到任何解决方法吗? What is the C++ way of doing what I want to do? 做我想做的事的C ++方式是什么?
Do you see any workaround? 你看到任何解决方法吗? What is the C++ way of doing what I want to do? 做我想做的事的C ++方式是什么?
Use a smart pointer instead: 改为使用智能指针 :
std::unique_ptr<Model> myModel;
if (modelIsNeeded(arguments)) {
myModel = std::make_unique<Model>(arguments);
}
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