Comparison Algorithms

An introduction to the eight main comparison algorithms in the C++ Standard Library

Ryan McCombe
Updated
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Questions & Answers

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std::equal() vs std::is_permutation()
What is the difference between equal() and is_permutation()?
Custom Comparison for std::equal()
How do I customize the comparison behavior for equal()?
Handling Mismatch Results
How do I handle past-the-end iterators returned by mismatch()?
Equal vs Lexicographical Compare
When should I use lexicographical_compare() over equal()?
Applications of is_permutation()
What are some practical applications of is_permutation()?
Comparing Different Length Ranges
How do I compare two ranges of different lengths using mismatch()?
Understanding Identity Permutations
What are identity permutations and why are they important?
Comparing Floating Point Numbers
How do I compare ranges that contain floating-point numbers?