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C++“Hello World”Boost TEE示例程序

boost-iostreams c++

12

CW Holeman II · 技术社区 · 17 年前

Boost C++库有 Function Template tee

类模板tee_filter和tee_device提供了两种方法来拆分输出序列使所有数据同时定向到两个不同的位置。

我正在寻找一个完整的C++示例,使用Boost TEE输出到标准输出,并输入到一个像“Stask.txt”这样的文件。

2 回复 | 直到 17 年前

1

26

Matthew Flaschen 17 年前

基于约翰链接的问题的帮助:

#include <boost/iostreams/tee.hpp>
#include <boost/iostreams/stream.hpp>
#include <fstream>
#include <iostream>

using std::ostream;
using std::ofstream;
using std::cout;

namespace bio = boost::iostreams;
using bio::tee_device;
using bio::stream;

int main()
{
    typedef tee_device<ostream, ofstream> TeeDevice;
    typedef stream<TeeDevice> TeeStream;
    ofstream ofs("sample.txt");
    TeeDevice my_tee(cout, ofs); 
    TeeStream my_split(my_tee);
    my_split << "Hello, World!\n";
    my_split.flush();
    my_split.close();
}

2

0

Martin Ba 11 年前

下面是一个使用 tee_filter 我目前正在使用tee我的boost。测试输出:

{ // init code, use static streams to keep them alive until test run process end

    using namespace boost::iostreams;
    static ofstream ofs("boost_test_output.log.xml"); // log file
    static tee_filter<ostream>  fileFilt(ofs); // tee all passed data to logfile

    // note derives from `boost::iostreams::output_filter`
    static text_xml_readability_filter xmlFilt; // filter all passed data, making the XML output readable

    static filtering_ostream filter; // master filter

    filter.push(fileFilt); // 1st, tee off any data to the file (raw boost XML)
    filter.push(xmlFilt);  // 2nd make the xml data stream readable (linebreaks, etc.)
    filter.push(cout);     // 3rd output the readable XML to cout

    boost::unit_test::unit_test_log.set_stream( filter );
}