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

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< cpp‎ | experimental

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

remove remove_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)

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