std::basic_ios::eof

 

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basic_ios::good

basic_ios::eof

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bool eof() const;

返回true相关联的数据流，如果已达到文件结束。具体而言，回报true如果eofbit在rdstate().

Original:

Returns true if the associated stream has reached end-of-file. Specifically, returns true if eofbit is set in rdstate().

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参数

（无）

Original:

(none)

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返回值

true的端部的文件，如果已经发生，false否则.

Original:

true if an end-of-file has occurred, false otherwise.

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注释

此功能仅报告最近的I / O操作流的状态，不检查相关的数据源。例如，如果最近​​的I / O是一个get()，它返回一个文件的最后一个字节，eof()回报false。接下来的get()无法读取任何东西，设置eofbit。只有这样，eof()回报true.

Original:

This function only reports the stream state as set by the most recent I/O operation, it does not examine the associated data source. For example, if the most recent I/O was a get(), which returned the last byte of a file, eof() returns false. The next get() fails to read anything and sets the eofbit. Only then eof() returns true.

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在典型的使用中，输入流处理停止的任何错误;eof()和fail()然后用于区分不同的错误条件.

Original:

In typical usage, input stream processing stops on any error; eof() and fail() are then used to distinguish between different error conditions.

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为例

#include <iostream>
#include <fstream>
#include <cstdlib>
int main()
{
    std::ifstream file("test.txt");
    if(!file)  // operator! is used here
    {  
        std::cout << "File opening failed\n";
        return EXIT_FAILURE;
    }
 
    // typical C++ I/O loop uses the return value of the I/O function
    // as the loop controlling condition, operator bool() is used here
    for(int n; file >> n; ) {
       std::cout << n << ' ';
    }
    std::cout << '\n';
 
    if (file.bad())
        std::cout << "I/O error while reading\n";
    else if (file.eof())
        std::cout << "End of file reached successfully\n";
    else if (file.fail())
        std::cout << "Non-integer data encountered\n";
}

另请参阅

ios_base::iostate flags			basic_ios accessors
eofbit	failbit	badbit	good()	fail()	bad()	eof()	operator bool()	operator!()
false	false	false	true	false	false	false	true	false
false	false	true	false	true	true	false	false	true
false	true	false	false	true	false	false	false	true
false	true	true	false	true	true	false	false	true
true	false	false	false	false	false	true	true	false
true	false	true	false	true	true	true	false	true
true	true	false	false	true	false	true	false	true
true	true	true	false	true	true	true	false	true

feof	检查文件结束 Original: checks for the end-of-file The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数）