c++ - 左值到右值的转换

Question

从 4.1/2

The value contained in the object indicated by the lvalue is the rvalue result. When an lvalue-to-rvalue conversion occurs within the operand of sizeof (5.3.3) the value contained in the referenced object is not accessed, since that operator does not evaluate its operand.

出于好奇，我在想，这是否同样适用于 if、for、while 语句，即在计算语句结果时将左值转换为右值？

Answer 1

是的。没有 lvalue-to-rvalue 转换，它无法读取它的值。

笼统地说，将左值视为某种容器，将右值视为容器中包含的值。

C++03，§3.10/7 节读取，

Whenever an lvalue appears in a context where an rvalue is expected, the lvalue is converted to an rvalue; see 4.1, 4.2, and 4.3.

与 §4.1/2(您的引文)一起阅读，

The value contained in the object indicated by the lvalue is the rvalue result.

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• What standard clause mandates this lvalue-to-rvalue conversion?