Difference between revisions of "cpp/io/basic fstream/swap2"
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< cpp | io | basic fstream
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Revision as of 19:41, 31 May 2013
| template< class CharT, class Traits > void swap( basic_fstream<CharT, Traits>& lhs, basic_fstream<CharT, Traits>& rhs ); |
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Specializes the std::swap algorithm for std::basic_fstream. Exchanges the state of lhs with that of rhs. Effectively calls lhs.swap(rhs).
Contents |
Parameters
| lhs, rhs | - | streams whose state to swap |
Return value
(none)
Exceptions
May throw implementation-defined exceptions.
Example
Run this code
#include <fstream> #include <iostream> #include <string> bool create_stream(std::fstream& fs) { try { std::string some_name = "/tmp/test_file.txt"; std::ios_base::openmode some_flags = fs.trunc; // | other flags if (std::fstream ts{some_name, some_flags}; ts.is_open()) { std::swap(ts, fs); // stream objects are not copyable => swap return true; } } catch (...) { std::cout << "Exception!\n"; } return false; } int main() { if (std::fstream fs; create_stream(fs)) { // use fs stream } }
See also
| (C++11) |
swaps two file streams (public member function) |
