How to erase elements from a vector of object?

Question

I know how we can remove elements from a vector of int

std::vector<int> vec; // .. put in some values .. int int_to_remove = n; vec.erase(std::remove(vec.begin(), vec.end(), int_to_remove), vec.end());

What if its a vector<obj> vec where obj is

class obj { int ID; string name; }

How would I remove vectors that are holding onto a certain ID ?

std::vector<obj> vec; // .. put in some values .. int id_to_remove = n; vec.erase(std::remove(vec.ID.begin(), vec.ID.end(), id_to_remove), vec.end());

remove calls destructor

Jens Munk
– Jens Munk

2016-08-18 11:16:37 +00:00
Commented Aug 18, 2016 at 11:16 — Jens Munk
– Jens Munk, Commented Aug 18, 2016 at 11:16

Sergey Kalinichenko · Accepted Answer · 2016-08-18 11:26:15Z

Now that you are looking to delete objects matching a certain criteria, you need to use std::remove_if instead of std::remove.

vec.erase( std::remove_if( vec.ID.begin() , vec.ID.end() , [](const obj& x) { // ID needs to be public in order for this to compile return x.ID == id_to_remove; } ) , vec.end() );

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