[英]C++ Qt Returning reference to a temporary
I cannot understand how to return a hashed string from function temporary memory (don't know how to correctly call it). 我不明白如何从函数临时存储器中返回哈希字符串(不知道如何正确调用它)。 Now, I have this code:
现在,我有以下代码:
static const QString &Utils::md5(const QString &inStr)
{
const QByteArray out = QCryptographicHash
::hash(inStr.toUtf8(), QCryptographicHash::Md5)
.toHex();
return QString(out);
}
But it gives warning during compilation and after I run my program it crashes. 但是它在编译期间发出警告,并且在我运行程序后崩溃。
Yes, you can't return a reference to a local object, even reference-to-const. 是的,您不能返回对本地对象的引用,甚至不能返回对const的引用。 I don't see a problem with returning by value, that is:
我看不到按值返回的问题,即:
static QString Utils::md5(const QString &inStr) { ... }
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