| (1) | |||
| (2) |
Manages the contents of the underlying string object.
1) Returns a copy of the underlying string as if by calling rdbuf()->str().
2) Replaces the contents of the underlying string as if by calling rdbuf()->str(new_str).
Parameters
| new_str | - | new contents of the underlying string |
Return value
1) a copy of the underlying string object.
2) (none).
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.
Example
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | #include <sstream>#include <iostream>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:
1 2 3 | 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" |
See also
| replaces or obtains a copy of the associated character string (public member function of std::basic_stringbuf) |
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