std::vector<std::string> EdgePolarityVector = {"BlackToWhite","WhiteToBlack","Both"};C++遍历查找有无"BlackToWhite"元素

在C++中，你可以使用`std::find_if`函数来遍历`std::vector<std::string>`并查找特定元素。这里是如何操作`EdgePolarityVector`来查找"BlackToWhite"元素的示例：

#include <iostream>
#include <vector>
#include <string>

int main() {
    std::vector<std::string> EdgePolarityVector = {"BlackToWhite", "WhiteToBlack", "Both"};

    auto it = std::find_if(EdgePolarityVector.begin(), EdgePolarityVector.end(), 
                            [](const std::string& str) { return str == "BlackToWhite"; });

    if (it != EdgePolarityVector.end()) {
        std::cout << "Found 'BlackToWhite' at index: " << std::distance(EdgePolarityVector.begin(), it) << std::endl;
    } else {
        std::cout << "'BlackToWhite' not found in the vector." << std::endl;
    }

    return 0;
}

这段代码会输出："Found 'BlackToWhite' at index: 0"，如果找到了"BlackToWhite"，否则会显示它没找到。