如何在另一个命名空间中使用ist c ++来设置一个命名空间的枚举

#include<iostream>
#include <fstream>
#include<string>

namespace myNamespace {
    enum class MyEnum {
        Value1,
        Value2,
        Value3
    };
}

int main() {
    std::ifstream inputFile("input.txt");
    std::string line;

    while (std::getline(inputFile, line)) {
        if (line == "Value1") {
            myNamespace::MyEnum value = myNamespace::MyEnum::Value1;
            std::cout << "Value1"<< std::endl;
        } else if (line == "Value2") {
            myNamespace::MyEnum value = myNamespace::MyEnum::Value2;
            std::cout << "Value2"<< std::endl;
        } else if (line == "Value3") {
            myNamespace::MyEnum value = myNamespace::MyEnum::Value3;
            std::cout << "Value3"<< std::endl;
        }
    }

    inputFile.close();
    return 0;
}