std::sub_match<BidirIt>:: swap

Exchanges the contents of two sub-match objects. Equivalent to

this - > pair < BidirIt, BidirIt > :: swap ( s ) ;
std:: swap ( matched, s. matched ) ;

Parameters

Exceptions

Example

#include <cassert>
#include <iostream>
#include <regex>
int main()
{
    const char* s = "Quick red cat";
    std::sub_match<const char*> x, y;
    x.first = &s[0];
    x.second = &s[5];
    x.matched = false;
    y.first = &s[012];
    y.second = &s[13];
    y.matched = true;
    std::cout << "Before swap:\n";
    std::cout << "x.str() = [" << x.str() << "]\n";
    std::cout << "y.str() = [" << y.str() << "]\n";
    assert(!x.matched and y.matched);
    x.swap(y);
    std::cout << "After swap:\n";
    std::cout << "x.str() = [" << x.str() << "]\n";
    std::cout << "y.str() = [" << y.str() << "]\n";
    assert(x.matched and !y.matched);
}

Before swap:
x.str() = []
y.str() = [cat]
After swap:
x.str() = [cat]
y.str() = []

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.