boost :: iostreams编译错误::复制

Question

我想通过一些例子学习boost :: iostreams。这里是其中的一个不能用GCC接受：

#include <iostream> 
#include <boost/iostreams/filter/regex.hpp> 
#include <boost/iostreams/copy.hpp> 
#include <boost/iostreams/filtering_stream.hpp> 
#include <boost/iostreams/device/back_inserter.hpp> 

using namespace std; 

int main() 
{ 
    boost::regex reg("a.c");  
    string str("abcdef aochijk"); 
    string result; 
    boost::iostreams::copy(
       boost::make_iterator_range(str),  
       boost::iostreams::filtering_ostream( 
        boost::iostreams::regex_filter(reg,"test") |  
        boost::iostreams::back_inserter(result))  
       ); 
    cout<<result<<endl; 
    return 0; 
} 

这里是错误：

error:no matching function for call to 'copy(boost::iterator_range<__gnu_cxx::__normal_iterator<char*, std::basic_string<char> > >, boost::iostreams::filtering_ostream)' 

error:no type named 'type' in 'struct boost::disable_if<boost::iostreams::is_std_io<boost::iostreams::filtering_stream<boost::iostreams::output> >, void>' 

Answer 1

我铛的副本失败的编译为好，告诉我note: candidate function [snip] not viable: expects an l-value for 2nd argument。

这似乎是相当合理的，我，和，事实上，这个编译：

boost::regex reg("a.c");  
string str("abcdef aochijk"); 
string result; 
boost::iostreams::filtering_ostream ios( 
       boost::iostreams::regex_filter(reg,"test") |  
       boost::iostreams::back_inserter(result)); 
boost::iostreams::copy(boost::make_iterator_range(str), ios); 

Answer 2

#include <iostream> 
#include <boost/iostreams/filter/regex.hpp> 
#include <boost/iostreams/copy.hpp> 
#include <boost/iostreams/filtering_stream.hpp> 
#include <boost/iostreams/device/back_inserter.hpp> 

using namespace std; 

int main() 
{ 
    boost::regex reg("a.c");  
    string str("abcdef aochijk"); 
    string result; 
    boost::iostreams::filtering_ostream fos(boost::iostreams::regex_filter(reg,"test") |  
              boost::iostreams::back_inserter(result)) ; 
    boost::iostreams::copy(boost::make_iterator_range(str),fos); 
    cout<<result<<endl; 
    return 0; 
}