C++ 概念： UnformattedInputFunction

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[编辑] 要求

UnformattedInputFunction流输入功能，执行以下操作：
Original:
An UnformattedInputFunction is a stream input function that performs the following:
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  • 构造一个对象具有自动存储时间和basic_istream::sentry参数设置为noskipws，将执行以下类型的true
    Original:
    Constructs an object of type basic_istream::sentry with automatic storage duration and with the noskipws argument set to true, which performs the following
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  • 如果eofbitbadbit上设置的输入流，设置failbit，并在此输入流的异常掩码，如果failbit异常启用抛出ios_base::failure.
    Original:
    if eofbit or badbit are set on the input stream, sets the failbit as well, and if exceptions on failbit are enabled in this input stream's exception mask, throws ios_base::failure.
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  • 刷新了tie（）'d输出流（如适用）
    Original:
    flushes the tie()'d output stream, if applicable
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  • 检查的状态通过调用sentry::operator bool()，这是相当于basic_ios::good哨兵.
    Original:
    Checks the status of the sentry by calling sentry::operator bool(), which is equivalent to basic_ios::good.
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  • 如果返回的哨兵false或哨兵的构造函数抛出一个异常
    Original:
    If the sentry returned false or sentry's constructor threw an exception:
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  • 提取出的字符的数目（gcount的）设置在输入流中为零
    Original:
    sets the number of extracted characters (gcount) in the input stream to zero
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  • 如果函数被调用写数组的CharT，写CharT()（空字符）的数组的第一个位置
    Original:
    if the function was called to write to an array of CharT, writes CharT() (the null character) to the first location of the array
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  • 如果返回的哨兵true，进行输入
    Original:
    If the sentry returned true, performs the input
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  • 如果抛出一个异常在输入过程中，设置badbit输入流中。中启用此流的异常掩码如果badbit的异常，该异常被重新抛出.
    Original:
    if an exception is thrown during input, sets badbit in the input stream. If exceptions on badbit are enabled in this stream's exception mask, the exception is also rethrown.
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  • 如果没有异常被抛出在输入过程中，将输入流中提取的字符数（gcount的）.
    Original:
    If no exception was thrown during input, sets the number of extracted characters (gcount) in the input stream.
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  • 在任何情况下，无论是终止异常或返回，哨兵的析构函数被调用之前离开此功能.
    Original:
    In any event, whether terminating by exception or returning, the sentry's destructor is called before leaving this function.
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[编辑] 标准库

以下的标准库函数UnformattedInputFunctions.
Original:
The following standard library functions are UnformattedInputFunctions.
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来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/concept/UnformattedInputFunction&oldid=26661”