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Showing content from https://en.cppreference.com/w/cpp/language/../io/basic_stringbuf/../basic_stringstream/str.html below:

std::basic_stringstream<CharT,Traits,Allocator>::str - cppreference.com

(1) (until C++20) (since C++20) template< class SAlloc > std::basic_string<CharT, Traits, SAlloc> str( const SAlloc& a ) const; (2) (since C++20) (3) (since C++20) (4) template< class SAlloc > void str( const std::basic_string<CharT, Traits, SAlloc>& s ); (5) (since C++20) (6) (since C++20)

template< class StringViewLike > void str( const StringViewLike& t );

(7) (since C++26)

Manages the contents of the underlying string object.

1) Returns a copy of the underlying string. Equivalent to return rdbuf()->str();.

2) Returns a copy of the underlying string, using a as allocator. Equivalent to return rdbuf()->str(a);.

3) Returns a string move-constructed from the underlying string. Equivalent to return std::move(*rdbuf()).str();.

4,5) Replaces the contents of the underlying string. Equivalent to rdbuf()->str(s);.

6) Replaces the contents of the underlying string. Equivalent to rdbuf()->str(std::move(s));.

7) Replaces the contents of the underlying string. Equivalent to rdbuf()->str(t);.

This overload participates in overload resolution only if is_convertible_v<const T&, basic_string_view<charT, traits>> is true.

[edit] Parameters s - new contents of the underlying string t - an object (convertible to std::basic_string_view) to use as the new contents of the underlying string a - allocator used to construct the returned string [edit] Return value

1,2) A copy of the underlying string object.

3) A string move-constructed from the underlying string object.

4-7) (none)

[edit] Notes

The copy of the underlying string returned by str is a temporary object that will be destructed at the end of the expression, so directly calling c_str() on the result of str() (for example in auto *ptr = out.str().c_str();) results in a dangling pointer.

[edit] Example

#include <iostream>
#include <sstream>
 
int main()
{
    int n;
 
    std::istringstream in; // could also use in("1 2")
    in.str("1 2");
    in >> n;
    std::cout << "After reading the first int from \"1 2\", the int is "
              << n << ", str() = \"" << in.str() << "\"\n";
 
    std::ostringstream out("1 2");
    out << 3;
    std::cout << "After writing the int '3' to output stream \"1 2\""
              << ", str() = \"" << out.str() << "\"\n";
 
    std::ostringstream ate("1 2", std::ios_base::ate);
    ate << 3;
    std::cout << "After writing the int '3' to append stream \"1 2\""
              << ", str() = \"" << ate.str() << "\"\n";
}

Output:

After reading the first int from "1 2", the int is 1, str() = "1 2"
After writing the int '3' to output stream "1 2", str() = "3 2"
After writing the int '3' to append stream "1 2", str() = "1 23"

[edit] See also returns the underlying raw string device object
(public member function) [edit] replaces or obtains a copy of the associated character string
(public member function of std::basic_stringbuf<CharT,Traits,Allocator>) [edit]

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