C++ Fstream Library - rdbuf Function

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Description

It returns a pointer to the internal filebuf object.

Declaration

Following is the declaration for fstream::rduf.

C++11

 filebuf* rdbuf() const; 

Return Value

It returns a pointer to the internal filebuf object.

Exceptions

Strong guarantee − if an exception is thrown, there are no changes in the stream buffer.

Data races

• It accesses the stream object.

• It concurrent access to the same stream object may cause data races.

Example

In below example explains about fstream rdbuf function.

 #include <fstream> #include <cstdio> int main () { std::fstream src,dest; src.open ("test.txt"); dest.open ("copy.txt"); std::filebuf* inbuf = src.rdbuf(); std::filebuf* outbuf = dest.rdbuf(); char c = inbuf->sbumpc(); while (c != EOF) { outbuf->sputc (c); c = inbuf->sbumpc(); } dest.close(); src.close(); return 0; }