如何找出一个项目是否存在于性病: : 载体？

Question

All I want to do is to check whether an element exists in the vector or not, so I can deal with each case.

if ( item_present )
   do_this();
else
   do_that();

转载于:https://stackoverflow.com/questions/571394/how-to-find-out-if-an-item-is-present-in-a-stdvector

Answer 1

You can use std::find from <algorithm>:

std::find(vector.begin(), vector.end(), item) != vector.end()

This returns a bool (true if present, false otherwise). With your example:

#include <algorithm>

if ( std::find(vector.begin(), vector.end(), item) != vector.end() )
   do_this();
else
   do_that();