我想把FindFirstKey1函数转换成一个叫做FindFirstKey2的lambda函数：
以下是我的尝试：

#include <vector>

struct Point
{
    int x;
    int y;
};

bool FindFirstKey1(std::vector<Point> &m, Point &FirstKeyFound, int currentKeyIndex, int SearchKey)
{
    if (currentKeyIndex < m.size())
    {
        auto key1 = m[currentKeyIndex];

        if (key1.x <= SearchKey)
        {
            FirstKeyFound = key1;
            return true;
        }
    }

    return false;
}

int main()
{
    std::vector <Point> m;
    Point FirstKeyFound;
    int currentKeyIndex;
    int SearchKey;

    bool FindFirstKey2 = [&m, &FirstKeyFound, currentKeyIndex, SearchKey]()
    {
        if (currentKeyIndex < m.size())
        {
            auto key1 = m[currentKeyIndex];

            if (key1.x <= SearchKey)
            {
                FirstKeyFound = key1;
                return true;
            }
        }

        return false;
    };

    FindFirstKey1(m, FirstKeyFound, currentKeyIndex, SearchKey);
    FindFirstKey2(m, FirstKeyFound, currentKeyIndex, SearchKey);
}

我仍然收到一些我不理解的错误：
错误C2440“初始化”：无法从“main：：”转换<lambda_55baf115e13173580997f8ba93ea8513>为“bool”
我需要什么来使它工作，即调用lambda函数就像我调用正则函数一样？