Many library functions return Future objects, and you can register handlers to respond to events such as mouse clicks, file I/O completions, and timer expirations.
您还可以通过隐式使每个函数返回错误值并对其进行检查来生成代码。
You could also generate code by implicitly making every function return an error value and checking it.
Upper(X)函数返回输入字符串X的副本,其中所有小写ASCII字符都转换为等效的大写字母.
The upper(X) function returns a copy of input string X in which all lower-case ASCII characters are converted to their upper-case equivalent.
Stat和fstat函数返回包含所有文件属性的一个信息结构。
The stat and fstat functions return a structure of information containing all the attributes of a file.
Stdin函数返回一个std::io::Stdin的实例,这代表终端标准输入句柄的类型。
The stdin function returns an instance of std::io::Stdin, which is a type that represents a handle to the standard input for your terminal.
抽象类型不能用作参数类型、函数返回类型或显式转换的类型。
Abstract types cannot be used as parameter types, as function return types, or as the type of an explicit conversion.
其他函数返回随后可用于输入到其他函数的表。
Other functions return a table that can then be used as input to other functions..
Each()函数返回input_array的当前键/值对,并将指针推进一个位置。
The each() function returns the current key/value pair from the input_array, and advances the pointer one position.
有些函数返回有用的值,而有些函数(如copy)仅用于执行一些动作,并不返回值。
Some functions return a useful value; others, like copy, are used only for their effect and return no value.
如果函数返回类型为void,则不能提供变量来接收函数返回的值,因为void函数不返回任何值。
If function return type is void, you must not provide the variable because void functions doesn't return any value.
如果x的绝对值超过π乘以252,则这些函数返回ERANGE错误,表示结果已完全失去意义。
If x is positive andexceeds pi times 2^52, these functions return an ERANGE error, denoting total loss of significance in the result.
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