Find if a string contains a character in C++ (boost allowed)

Question

Suppose I have a string and I want to find whether a specific character (like \'|\') is present or not, what is the best and fastest technique to do so? I know string find i

Answer 1

Use std::string::find

if (str.find('|') != std::string::npos)
{
    // ...
}

There's unlikely to be anything more efficient. O(n) is the best you can do. The standard library implementation should be pretty much optimal.