如何從cpp中的function返回字典

Question

我有這個代碼

#include <map>
#include <tuple>

int test(int x, int y){
   std::map<std::tuple<int, int>, std::string> test_1;
   std::tuple<int, int> test2;
   test2 = make_tuple(x,y);
   test_1.insert<std::pair<std::tuple<int, int>, std::string>(test2, "string");
   return test_1;
}

錯誤：

'return': 無法從 'std::mapstd::tuple<int,int,std::string,std::lessstd::tuple<int,int>,std::allocator<std::pair<const std ::tuple<int,int>,std::string>>>' 到 'int'

Answer 1

您想返回std::map<std::tuple<int, int>, std::string>但您已將返回類型寫為int 。

#include <map>
#include <tuple>

std::map<std::tuple<int, int>, std::string> test(int x, int y){
   std::map<std::tuple<int, int>, std::string> test_1;
   std::tuple<int, int> test2;
   test2 = make_tuple(x,y);
   test_1.insert<std::pair<std::tuple<int, int>, std::string>(test2, "string");
   return test_1;
}