C++ 模板函数中未解析的外部符号
我已在Visual Studio 2019中创建了此静态库,但出现以下错误:C++ 模板函数中未解析的外部符号,c++,function,templates,unresolved-external,C++,Function,Templates,Unresolved External,我已在Visual Studio 2019中创建了此静态库,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 shor
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)
未解析的外部符号“无符号短\uuuuCDECL方法2(类std::basic\uString const&,无符号短)”
??$method2@G@@YAGABV?$basic_string@DU?$char_traits@D@性病病毒$allocator@D@2@@std@@G@Z)
//Lib.h
#布拉格语一次
#包括“Enter.h”
#包括
#包括
模板
方法1(常量std::string&=“”,T=-1);
模板
方法2(常量std::string&=“”,T=-1);
//Lib.cpp
#包括“pch.h”
#包括“Lib.h”
使用名称空间std;
无符号短方法1(常量字符串和文本,无符号短最大值)
{
串入;
无符号短val;
while(true)
{
cout max)抛出val;
}
捕获(…)
{
cerr您似乎想要对模板函数进行完全的专门化。为此,您需要在定义之前添加一个模板。@n314159,即使我不使用它?对于每个定义还是仅针对一个?什么是“内联”定义对我来说不是正确的方式,因为我需要只调用这些类型确切的意思是?您可以使用SFINAE/std::enable_if
使模板有选择地可用于某些类型。@是的,您需要告诉编译器您希望专门化此函数,而不是以另一种方式重写它。@n314159谢谢,它起了作用!您似乎想要对模板函数进行完全专门化。为此您需要在定义之前添加一个模板
。@n314159,即使我不使用它?对于每个定义还是仅用于一个?什么是“内联”定义对我来说不是正确的方式,因为我需要只能调用这些类型…”确切的意思是?您可以使用SFINAE/std::enable_if
使模板有选择地可用于某些类型。@是的,您需要告诉编译器您希望专门化此函数,而不是以其他方式重写它。@n314159谢谢,它起作用了!
//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) });
}