std::experimental::erase_if (std::list)

 

C++

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Freestanding and hosted

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Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

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Technical specifications

Symbols index

External libraries

 

Technical specifications

Filesystem library (filesystem TS)

Library fundamentals (library fundamentals TS)

Library fundamentals 2 (library fundamentals TS v2)

Library fundamentals 3 (library fundamentals TS v3)

Extensions for parallelism (parallelism TS)

Extensions for parallelism 2 (parallelism TS v2)

Extensions for concurrency (concurrency TS)

Extensions for concurrency 2 (concurrency TS v2)

Concepts (concepts TS)

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Library fundamentals v2

experimental::propagate_const

experimental::not_fn

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experimental::make_array

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experimental::ostream_joiner

experimental::gcd

experimental::lcm

experimental::source_location

experimental::randint

detection idiom

uniform container erasure

logical operator type traits

 

Defined in header <experimental/list>
template< class T, class Alloc, class Pred > void erase_if( std::list<T,Alloc>& c, Pred pred );		(library fundamentals TS v2)

Erases all elements that satisfy the predicate pred from the container. Equivalent to c.remove_if(pred);

Parameters

c	-	container from which to erase
pred	-	predicate that determines which elements should be erased

Complexity

Linear.

Example

Run this code

#include <experimental/list>
#include <iostream>
 
template<typename Os, typename Container>
inline Os& operator<<(Os& os, Container const& container)
{
    os << "{ ";
    for (const auto& item : container) {
        os << item << ' ';
    }
    return os << "}";
}
 
int main()
{
    std::list<int> data { 3, 3, 4, 5, 5, 6, 6, 7, 2, 1, 0 };
 
    std::cout << "Original:\n" << data << '\n';
 
    auto divisible_by_3 = [](auto const& x) { return (x % 3) == 0; };
 
    std::experimental::erase_if(data, divisible_by_3);
 
    std::cout << "Erase all items divisible by 3:\n" << data << '\n';
}

Output:

Original:
{ 3 3 4 5 5 6 6 7 2 1 0 }
Erase all items divisible by 3:
{ 4 5 5 7 2 1 }

See also

removeremove_if	removes elements satisfying specific criteria (function template)
removeremove_if	removes elements satisfying specific criteria (public member function of std::list<T,Allocator>)
erase (std::list) (library fundamentals 2 TS)	Erases all elements equal to a specific value from a std::list (function template)