# std::basic_stringbuf<CharT,Traits,Allocator>::view

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< cpp‎ | io‎ | basic stringbuf

std::basic_string_view<CharT, Traits> view() const noexcept; |  | (since C++20)

Creates and returns a std::basic_string_view over the underlying character sequence.

- For input-only streams, the returned view represents the range [eback(), egptr()).
- For input/output or output-only streams, references the characters from pbase() to the last character in the sequence regardless of egptr() and epptr().
- If the stream is neither input nor output, returns std::basic_string_view<CharT, Traits>{}.

The member character sequence in a buffer open for writing can be over-allocated for efficiency purposes. In that case, only the initialized characters are referenced: these characters are the ones that were obtained from the string argument of the constructor, the string argument used by the most recent call to a setter overload of `str()`, or from a write operation. A typical implementation that uses over-allocation maintains a high-watermark pointer to track the end of the initialized part of the buffer and the returned view references the characters from pbase() to the high-watermark pointer.

### Parameters

(none)

### Return value

A view over the underlying character sequence.

### Notes

Using of the return value is undefined behavior if the underlying character sequence is destroyed or invalidated, unless the return value is empty.

This function is typically accessed through std::basic_istringstream::view(), std::basic_ostringstream::view(), or std::basic_stringstream::view().

### See also

str | replaces or obtains a copy of the associated character string (public member function)
operator basic_string_view (C++17) | returns a non-modifiable string_view into the entire string (public member function of `std::basic_string<CharT,Traits,Allocator>`)

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