CPP – Unique Copy In STL

Published by theArcticOcean on

std::unique_copy is an algorithm which can be used to copy elements without duplicating objects in adjacent locations.

template< class InputIt, class OutputIt >
OutputIt uniquecopy( InputIt first, InputIt last, OutputIt dfirst );

Usage example:

C++
#include 
#include 
#include 
#include 

int main()
{
    std::string s1 = "This is   a story   about       hhhhero!";
    std::cout << s1 << std::endl;

    std::string s2;
    std::unique_copy(s1.begin(), s1.end(), std::back_inserter(s2));

    std::cout <<  s2 << std::endl;
    return 0;
}

output:

Bash
This is   a story   about       hhhhero!

This is a story about hero!

Add lambda expressions to remove duplicating space:

C++
    std::unique_copy(s1.begin(), s1.end(), std::back_inserter(s2),
                     [](const char c1, const char c2){ return (c1 == ' ' && c2 == ' '); });

output:

Bash
This is   a story   about       hhhhero!

This is a story about hhhhero!
Categories: CPlusPlus
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