c++ - std::fstream 和 Boost Iostreams 库之间的区别

Question

我是 BOOST 库的新手。今天看到一小段代码，其中读写PGM格式图片是用Boost Iostreams Library实现的。随着我对 STL 越来越熟悉，我可以很容易地看出 std::fstream 可以完成同样的工作。那么我的问题是，在这样一个简单的读写PGM图像的应用程序中使用Boost库有什么意义呢？此外，我想知道在什么情况下最需要 BOOST Iostreams 库。谢谢!

Answer 1

来自 std::fstream reference :

fstream provides an interface to read and write data from files as input/output streams.

来自 Boost.Iostreams reference :

Boost.Iostreams has three aims:

• To make it easy to create standard C++ streams and stream buffers for accessing new Sources and Sinks.
• To provide a framework for defining Filters and attaching them to standard streams and stream buffers.
• To provide a collection of ready-to-use Filters, Sources and Sinks.