链接c ++流 [英] chaining c++ streams

问题描述

我在想连接两个c ++ iostreams，然后过滤输入两次。我使用gzstreams读取zlib压缩文件，我正在考虑编码一个流从流读取和执行编码转换。

I was thinking of "chaining" a couple of c++ iostreams toghether to filter input twice. I'm using gzstreams to read zlib compressed files and I was thinking of coding a stream that reads from a stream and performs encoding conversions. Perhaps by passing an opened stream as constructor parameter... How do you think this could be best accomplished?

推荐答案

我不知道如何解决这个问题， t使用了此功能，但增强的 filtering_stream 可能有帮助。

I haven't used this but boost's filtering_stream may help.

例如，我发现邮寄名单，其中 indent.hpp ，它实现了缩进输出的输出过滤器：

As an example I found a mailing list post with indent.hpp, which implements an output filter that indents outputs:

boost::iostreams::filtering_ostream out; 
indent_filter::push(out,2); 
out.push(std::cout);

并使用它：

And use it like so:

out << "Hello Filter!\n" 
	<< indent_in 
	<< "this is\n" 
	<< "indented\n" 
	<< indent_out 
	<< "until here\n" 
	;

这将导致输出：

Which will result in output:

Hello Filter! 
  this is 
  indented 
until here

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