这个表达式是左值还是右值？
Is this expression an lvalue or an rvalue?
看看这个表达式：
T t;
T& ref = t;
ref 表达式是 lvalue 还是 rvalue? 我相信它是 rvalue 因为 ref 不 "designates a function or an object":
"An lvalue (so called, historically, because lvalues could appear on
the left-hand side of an assignment expression) designates a function
or an object."
[开放标准草案 n3092]
根据 cppreference，引用不是对象。
"The following entities are not objects: value, reference [...]"
我有疑问，因为 ref 在 = 的左边。
引用确实指定了函数或对象！标准里就是这么写的！参见 [expr.type]/1:
If an expression initially has the type “reference to T” ([dcl.ref], [dcl.init.ref]), the type is adjusted to T prior to any further analysis.
The expression designates the object or function denoted by the reference,[...]
I'm in doubt, because ref is in the left side of =.
ref 是一个名称，因此是一个左值。
I believe it's an rvalue because ref does not "designates a function or an object"
它指定与 t 相同的对象。
看看这个表达式：
T t;
T& ref = t;
ref 表达式是 lvalue 还是 rvalue? 我相信它是 rvalue 因为 ref 不 "designates a function or an object":
"An lvalue (so called, historically, because lvalues could appear on the left-hand side of an assignment expression) designates a function or an object."
[开放标准草案 n3092]
根据 cppreference，引用不是对象。
"The following entities are not objects: value, reference [...]"
我有疑问，因为 ref 在 = 的左边。
引用确实指定了函数或对象！标准里就是这么写的！参见 [expr.type]/1:
If an expression initially has the type “reference to T” ([dcl.ref], [dcl.init.ref]), the type is adjusted to T prior to any further analysis. The expression designates the object or function denoted by the reference,[...]
I'm in doubt, because ref is in the left side of =.
ref 是一个名称，因此是一个左值。
I believe it's an rvalue because ref does not "designates a function or an object"
它指定与 t 相同的对象。