QCache和std :: shared_ptr [英] QCache and std::shared_ptr

问题描述

有人可以给我提示此错误的提示：

Can someone give me please a hint for this error:

no viable conversion from 'std::shared_ptr<Foo>' to 'std::__1::shared_ptr<Foo> *'

QCache看起来像这样：

The QCache looks like this:

QCache<int, std::shared_ptr<Foo>> cache;

我试着插入这样的元素：

And I try to insert the element like this:

std::shared_ptr<Foo> foo;
cache.insert(23, foo);

推荐答案

$ b解决方案

解决方案

刚刚看了QCache API，由于我的猜测是正确的，我将它作为一个答案（希望upvotes！）。

Just looked into QCache API, and since my guess is correct, I will post it as an answer (with hopes for upvotes!).

的签名是 bool QCache :: insert（const Key& key，T * object，int cost = 1） code>。此外，API提到了QCache从那一刻起拥有指针的事实，所以你根本不需要shared_ptr。相反，你应该插入由QCache管理的原始指针。

Signature for insert() is bool QCache::insert(const Key & key, T * object, int cost = 1). Moreover, API mentions the fact that QCache owns the pointer from that moment on, so you do not need shared_ptr at all. Instead, you should insert raw pointer which will be managed by QCache.

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