Find string in vector of strings case insensitive c++(在不区分大小写的字符串向量中查找字符串 C++)

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问题描述

I have 

std::vector<std::string> vec;
std::string myString;

and I need to find out if myString is in vec using case insensitive comaprisons.

I know I can use 

find(vec.begin(), vec.end(), myString) != vec.end())

to answer the question "is myString in vec?" but that will do case sensitive comparisons. I need case insensitive comparisons.

The position is not important, I just want to know if myString is in vec or not.

解决方案

Or, for a much smaller and easier-to-read solution, Boost!

// #include <algorithm>
// #include <boost/algorithm/string/predicate.hpp>

const auto it = std::find_if(
   std::begin(vec),
   std::end(vec),
   [&myString](const auto& str) { return boost::iequals(myString, str); }
);

const bool found = (it != std::end(vec));

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