The context in which an lvalue appears determines how it is used.
左值出现的上下文决定了左值是如何使用的。
Distinguish between an lvalue and an rvalue; show examples of each.
区分左值和右值，并举例说明。
C + + 11 standard ref for not initializing rvalue reference with lvalue?
11标准c++裁判没有初始化和左值右值引用吗？
Like the subscript and dereference operators, assignment returns an lvalue.
与下标和解引用操作符一样，赋值操作也返回左值。
Some operators, such as assignment, require that one of their operands be an lvalue.
有些操作符，比如赋值，要求其中的一个操作数必须是左值。
An object is a named region of storage; an lvalue is an expression referring to an object.
这时候的左值可以解释为：对象是一个命名的存储区域，左值是对象引用的表达式。
The subroutines chapter covers new syntax (prototypes and attributes), plus the brand new lvalue attribute (as of 5.6.0).
子程序这章主要针对新的语法(原型和属性)，以及左值属性(5.6.0)。
An expression cannot be a reference, although you can bind the result of an expression with an lvalue or rvalue reference.
一个表达不能参考，虽然你可以绑定用一个表达式的结果左值或右值参考。
Next the function determines the length of each assignment's lvalue, by mapping the strlen function over a copy of the filtered lines.
接下来的函数确定每个赋值项的lvalue的长度，这通过将strlen函数映射到已过滤的函数的副本上来实现。
Instead of magic indexes, we get meaningful names (such as v: val.lval for each line's lvalue and line.op for each line's operator).
不使用神奇索引，我们将获得有意义的名称(例如，v： val .lval用于各行的lvalue,line . op用于各行的操作符)。
Until now, special care had to be taken to allow modification of object attributes, for example. With lvalue subroutines, you can directly affect scalars returned by subroutines.
直到目前为止，修改对象属性时需要费一些特别的心思，例如使用左值子程序，你就可以直接操作子程序返回的标量。
Through computing the lvalue of an expression in the points-to graph, we get all the modified memory locations. Thus we can get all the expressions that may be modified in the called procedure.
该算法通过计算表达式在指向图中的左值，得到所有可能被修改的内存位置，从而计算出所有可能在被调用过程中被修改的表达式。
Through computing the lvalue of an expression in the points-to graph, we get all the modified memory locations. Thus we can get all the expressions that may be modified in the called procedure.
该算法通过计算表达式在指向图中的左值，得到所有可能被修改的内存位置，从而计算出所有可能在被调用过程中被修改的表达式。
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