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Defined in header <flat_set> | ||
template<class Key,class Compare,class KeyContainer, class Pred> | (since C++23) (constexpr since C++26) | |
Erases all elements that satisfy the predicatepred fromc.
The predicatepred is satisfied if the expressionbool(pred(std::as_const(e))) istrue, wheree is some element inc.
IfKey is notMoveAssignable, the behavior is undefined.
Contents |
| c | - | container adaptor from which to erase |
| pred | - | predicate that returnstrue if the element should be erased |
The number of erased elements.
Exactlyc.size() applications of the predicatepred.
Iferase_if throws,c remains in valid but unspecified (maybe empty) state.
The algorithm is stable, that is, the order of elements that are not deleted remains unchanged.
#include <iostream>#include <flat_set> void println(auto rem,constauto& container){std::cout<< rem<<'{';for(char sep[]{0,' ',0};constauto& item: container)std::cout<< sep<< item,*sep=',';std::cout<<"}\n";} int main(){std::flat_set data{3,3,4,5,5,6,6,7,2,1,0}; println("Original:\n", data); auto divisible_by_3=[](constauto& x){return(x%3)==0;}; constauto count=std::erase_if(data, divisible_by_3); println("Erase all items divisible by 3:\n", data);std::cout<< count<<" items erased.\n";}
Output:
Original:{0, 1, 2, 3, 4, 5, 6, 7}Erase all items divisible by 3:{1, 2, 4, 5, 7}3 items erased.| removes elements satisfying specific criteria (function template)[edit] | |
(C++20)(C++20) | removes elements satisfying specific criteria (algorithm function object)[edit] |
