c++ map: 根据value逆向查找key

#include <iostream>

#include <map>

#include <algorithm>

#include <vector>

#include <string>

using namespace std;

class finder

{

public:

    finder(const std::string &cmp_string) :s_(cmp_string){}

    bool operator ()(const std::map<int, std::string>::value_type &item)

    {

        return item.second == s_;

    }

private:

    const std::string &s_;

};

int main()

{

    map<uint32_t, string> t;

	t.insert(std::make_pair(1, "cpu_syscall_pid"));

	t.insert(std::make_pair(2, "cpu_syscall_cpu"));

	t.insert(std::make_pair(3, "cpu_syscall_sys"));

	t.insert(std::make_pair(4, "cpu_contxt_pid"));

	int n = 0;

	auto it = std::find_if(t.begin(), t.end(), finder("cpu_syscall_pid"));

    if (it != t.end())

    {

        n = (*it).first;

    }

	cout << "n:" << n << endl;

	return 0;

}

巴特西

c++ map: 根据value逆向查找key

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