c++ - 模板函数中未解析的外部符号

Question

我在Visual Studio 2019中创建了这个静态库，但出现以下错误：

unresolved external symbol "unsigned short __cdecl method2<unsigned short>(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char>> const &,unsigned short)"
??$method2@G@@YAGABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@G@Z)

//Lib.h

#pragma once
#include "Enter.h"
#include <iostream>
#include <string>

template <typename T>
T method1(const std::string& = "", T = -1);

template <typename T>
T method2(const std::string& = "", T = -1);

---

//Lib.cpp

#include "pch.h"
#include "Lib.h"
using namespace std;

unsigned short method1(const string& text, unsigned short max)
{
    string ins;
    unsigned short val;

    while (true)
    {
        cout << text;
        getline(cin, ins);

        try
        {
            if (cin.fail()) cin.clear();
            val = stoi(ins);
            if (val > max) throw val;
        }
        catch (...)
        {
            cerr << "Risposta non valida!";
            Enter(2);
            continue;
        }

        break;
    }

    return val;
}
unsigned method1(const string& text, unsigned max)
{
    string ins;
    unsigned val;

    while (true)
    {
        cout << text;
        getline(cin, ins);

        try
        {
            if (cin.fail()) cin.clear();
            val = stoi(ins);
            if (val > max) throw val;
        }
        catch (...)
        {
            cerr << "Risposta non valida!";
            Enter(2);
            continue;
        }

        break;
    }

    return val;
}
unsigned long method1(const string& text, unsigned long max)
{
    string ins;
    unsigned long val;

    while (true)
    {
        cout << text;
        getline(cin, ins);

        try
        {
            if (cin.fail()) cin.clear();
            val = stoi(ins);
            if (val > max) throw val;
        }
        catch (...)
        {
            cerr << "Risposta non valida!";
            Enter(2);
            continue;
        }

        break;
    }

    return val;
}
unsigned long long method1(const string& text, unsigned long long max)
{
    string ins;
    unsigned long long val;

    while (true)
    {
        cout << text;
        getline(cin, ins);

        try
        {
            if (cin.fail()) cin.clear();
            val = stoi(ins);
            if (val > max) throw val;
        }
        catch (...)
        {
            cerr << "Risposta non valida!";
            Enter(2);
            continue;
        }

        break;
    }

    return val;
}

unsigned short method2(const string& text, unsigned short max)
{
    unsigned short val;

    while (true)
    {
        cout << text;
        if (cin >> val && val <= max) break;

        cin.clear();
        cin.ignore(numeric_limits<streamsize>::max(), '\n');

        cerr << "Risposta non valida!";
        Enter(2);
    }
    cin.ignore(numeric_limits<streamsize>::max(), '\n');

    return val;
}
unsigned method2(const string& text, unsigned max)
{
    unsigned val;

    while (true)
    {
        cout << text;
        if (cin >> val && val <= max) break;

        cin.clear();
        cin.ignore(numeric_limits<streamsize>::max(), '\n');

        cerr << "Risposta non valida!";
        Enter(2);
    }
    cin.ignore(numeric_limits<streamsize>::max(), '\n');

    return val;
}
unsigned long method2(const string& text, unsigned long max)
{
    unsigned long val;

    while (true)
    {
        cout << text;
        if (cin >> val && val <= max) break;

        cin.clear();
        cin.ignore(numeric_limits<streamsize>::max(), '\n');

        cerr << "Risposta non valida!";
        Enter(2);
    }
    cin.ignore(numeric_limits<streamsize>::max(), '\n');

    return val;
}
unsigned long long method2(const string& text, unsigned long long max)
{
    unsigned long long val;

    while (true)
    {
        cout << text;
        if (cin >> val && val <= max) break;

        cin.clear();
        cin.ignore(numeric_limits<streamsize>::max(), '\n');

        cerr << "Risposta non valida!";
        Enter(2);
    }
    cin.ignore(numeric_limits<streamsize>::max(), '\n');

    return val;
}

---

//main.cpp

#include <vector>
struct Client
{
    std::string name;
    unsigned short age;
};

int main()
{
    std::vector<Client> mylist;
    mylist.push_back({ temp, method2<unsigned short>("Insert age: ", 120) });
}

我还在Lib.h中收到两个警告：

未找到“方法 1”的函数定义。未找到“方法 2”的函数定义。

我究竟做错了什么？我已按照这些说明进行操作（替代解决方案）。

“内联”定义对我来说不是正确的方法，因为我需要只能调用这些类型......