Question

尝试使用bzip2压缩字符串，以便我可以通过具有ReadFile的管道发送它。

以下行为我带来了以下编译错误。

in.push（uncompressed_string）;

错误6错误C2027：使用未定义类型'boost :: STATIC_ASSERTION_FAILURE'c：\ program files（x86）\ boost \ boost_1_47 \ boost \ iostreams \ chain.hpp 488 1代理

boost::iostreams::filtering_streambuf<boost::iostreams::input> in;
ostringstream uncompressed_string;
ostringstream compressed_string;


uncompressed_string << buf;

in.push(boost::iostreams::bzip2_compressor());
in.push(uncompressed_string);

boost::iostreams::copy(uncompressed_string, compressed_string);

Answer 1

该错误是由于将输出流推送到输入过滤流作为其设备。

#include <sstream>
#include <string>
//#include <boost/iostreams/filtering_stream.hpp>
#include <boost/iostreams/filtering_streambuf.hpp>
#include <boost/iostreams/filter/bzip2.hpp>
#include <boost/iostreams/copy.hpp>
int main()
{
    std::string buf =  "this is a test\n";

    //boost::iostreams::filtering_istream in; // I think this is simpler
    boost::iostreams::filtering_streambuf<boost::iostreams::input> in;
    in.push(boost::iostreams::bzip2_compressor());
    std::istringstream uncompressed_string(buf);
    // in.push(boost::make_iterator_range(buf)); // another option
    in.push(uncompressed_string);
    std::ostringstream compressed_string;
    boost::iostreams::copy(in, compressed_string);

    std::cout << compressed_string.str();
}

用gcc 4.6.1测试并增强1.46

~ $ ./test | bzcat
this is a test

boost :: iostream :: filtering_streambuf的编译错误

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