我因两次定义了 function 而收到此错误

Question

Error :

CMakeFiles\Final_Project_2nd.dir/objects.a(Tab.cpp.obj): In function `Z8Type2IntNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE':
C:/Users/Andrea/CLionProjects/Final_Project_2nd/Utils.hpp:37: multiple definition of `Type2Int(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
CMakeFiles\Final_Project_2nd.dir/objects.a(main.cpp.obj):C:/Users/Andrea/CLionProjects/Final_Project_2nd/Utils.hpp:37: first defined here

I've created a header Utils.hpp with two enum s and two functions and I included it wherever I needed to use these things:

enum Types {
    OptionInt,
    OptionFloat,
    [...]
    OptionInvalid
};
enum Commands {
    CommandCreate = OptionInvalid + 1,
    CommandDrop,
    [...]
    CommandInvalid
};
Types Type2Int(string type){
    if(type == "int") return OptionInt;
    if(type == "float") return OptionFloat;
    [...]
    return OptionInvalid;
}
Commands Command2Int(string command){
    if(command == "CREATE") return CommandCreate;
    if(command == "DROP") return CommandDrop;
    [...]
    return CommandInvalid;
}

Answer 1

You are defining the function in the header, that's the problem. multiple definition in header file

The inline solution is fine, in alternative you can keep the declaration in the hpp file and implement it in a separate cpp file - which is the most 'standard' solution.