有没有办法一次操作数组的所有元素/一次操作多个变量？

Question

Given an int array database , instead of

if (user_input == int database[0] || user_input == int database[1])
{
    // ...
}

Could I do something more concise, like this?

if (user_input == any variable from database)
{
    // ...
}

Answer 1

What you probably are looking for is std::find algorithm.

Eg

if(std::end(database) != std::find(std::begin(database), std::end(database), user_input)) { ... }