Pedro d'Aquino Pedro d'Aquino - 8 days ago 5
C++ Question

Is there a standard way to compare two ranges in C++?

By range I mean a pair of iterators. In pseudo C++:

std::vector<int> v1 = { 1, 2, 3, 4, 5 };
std::vector<int> v2 = { 2, 3, 4 };
if( std::compare_range( v1.begin() + 1, v1.end() - 1, v2.begin(), v2.end() ) {
std::cout << "Alright\n";
}


compare_range
being of course the function I'm looking for.

Disclaimer: This is a pretty trivial function to write, I know. But like all programmers, I try to be lazy ;-)

Answer

std::equal is the function template you are looking for.

if (std::equal(v1.begin() + 1, v1.end() - 1, v2.begin())
{
    std::cout << "Alright\n";
}

Note that std::equal only takes three arguments, not four.

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