std::experimental::erase_if (std::basic_string)

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Execution support library (C++26)

Technical specifications

Symbols index

External libraries

 

Experimental

Technical Specification

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)

Ranges (ranges TS)

Reflection (reflection TS)

Mathematical special functions (special functions TR)

Experimental Non-TS

Pattern Matching

Linear Algebra

std::execution

Contracts

2D Graphics

 

Library fundamentals v2

experimental::propagate_const

experimental::not_fn

experimental::observer_ptr

experimental::make_array

experimental::to_array

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/string>
template< class CharT, class Traits, class Alloc, class Pred > void erase_if( std::basic_string<CharT, Traits, Alloc>& c, Pred pred );		(library fundamentals TS v2)

Erases all elements that satisfy the predicate pred from the container. Equivalent to c.erase(std::remove_if(c.begin(), c.end(), pred), c.end());.

Parameters

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

Complexity

Linear.

Example

Run this code

#include <experimental/string>
#include <iomanip>
#include <iostream>
 
int main()
{
    std::string data{"1337!p_C00L_<a-_HACKER_!@s_(!s#@_w^o%r*d#42"};
    std::cout << "Original string: " << std::quoted(data) << '\n';
    auto crack = [](auto O) { return '`' ^ ('`' & O); };
    std::experimental::erase_if(data, crack);
    std::cout << "After erase_if:  " << std::quoted(data) << '\n';
}

Output:

Original string: "1337!p_C00L_<a-_HACKER_!@s_{!s#@_w^o%r*d#42"
After erase_if:  "password"

See also

removeremove_if	removes elements satisfying specific criteria (function template)
erase (std::basic_string) (library fundamentals 2 TS)	erases all elements equal to a specific value from a std::basic_string (function template)