StackOverflow2013

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plurals

PO
primarykey
Id
15825240
data
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0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-04-05T03:06:54.483
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0
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2013-04-05T03:06:54.483
LastEditDate
2017-05-23T10:28:45.303
LastEditorUserId
-1
OwnerUserId
777186
ParentId
15824750
PostTypeId
2
Score
8
ViewCount
0
LastEditorDisplayName
text
Body
Passing the rvalue <code>rtByValue()</code> to a function that expects an lvalue reference doesn't work because this would require the lvalue reference argument to be initialized from an rvalue. §8.5.3/5 describes how lvalue references can be initialized – I won't quote it in full, but it basically says that an lvalue reference can be initialized <ul> <li>either from another lvalue reference</li> <li>or something that can be converted to an lvalue reference of an intermediary type</li> <li>or from an rvalue, but only if the lvalue reference we initialize is a const-reference</li> </ul> Since the argument we need to initialize is not a const-reference, none of this applies. On the other hand, <pre><code>rtByValue() = aa; </code></pre> i.e., assigning to a temporary object, is possible because of: <blockquote> (§3.10/5) An lvalue for an object is necessary in order to modify the object except that an rvalue of class type can also be used to modify its referent under certain circumstances. [ Example: a member function called for an object (9.3) can modify the object. — end example ] </blockquote> So this works only because <code>A</code> is of class-type, and the (implicitly defined) assignment operator is a member function. (See <a href="https://stackoverflow.com/questions/6466253/if-temporaries-are-implicitly-non-modifiable-how-does-this-work">this related question</a> for further details.) (So, if <code>rtByValue()</code> were to return, for example, an <code>int</code>, then the assignment wouldn't work.)
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1. POC++ function returns a rvalue, but that can be assigned a new value?
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1. POC++ function returns a rvalue, but that can be assigned a new value?
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