map中结构体的赋值

[树无影]

/************************************************************************/
/* pair对象的创建和使用                                                                     */
/************************************************************************/
#include <iostream>
#include <utility>
#include <map>
#include <string.h>
using namespace std;

class Student 
{
public:
	Student()
	{
		strcpy(m_sName, "NULL");
		m_nAge = 0;
	}

	Student(char sName[20], int nAge)
	{
		strcpy(m_sName ,sName);
		m_nAge = nAge;
	}
	Student(Student& s1)
	{
		strcpy(m_sName, s1.GetName());
		m_nAge = s1.GetAge();
	}

	int GetAge()
	{
		return m_nAge;
	}

	char * GetName()
	{
		return m_sName;
	}
private:
	char			m_sName[20];
	unsigned int	m_nAge;	
};

int main()
{
	Student s1("sdd",3);

	map<int, Student> m1;
	m1.insert(pair<int, Student>(12, s1) );


	
	return 0;
}

怎么传结构体啊？ 怎么改啊？

[ryfdizuo]

map<int, Student> m1;
m1.insert(pair<int, Student>(12, Student("sdd",3)) );
m1[13] = Student("scc", 4);

[无芒]

错误描述 error: Student 没有可用的复制构造函数或复制构造函数声明为“explicit”

容器元素类型有两个最基本的约束：
元素类型必须支持赋值运算
元素类型的对象必须可以复制

给 Student定义复制构造函数吧 因为容器内部的元素是通过复制初始化的~~

[merlinfang]

缺了拷贝构造，你那个没const的不行
Student(const Student& s1)

[caddor]

2010 通过



insert成员函数不就可以了吗

[树无影]

/************************************************************************/
/* pair对象的创建和使用                                                                     */
/************************************************************************/
#include <iostream>
#include <utility>
#include <map>
#include <string.h>
using namespace std;

class Student 
{
public:
	Student()
	{
		strcpy(m_sName, "NULL");
		m_nAge = 0;
	}

	Student(int a)
	{
		m_nAge = a;
	}

	Student(char sName[20], int nAge)
	{
		strcpy(m_sName ,sName);
		m_nAge = nAge;
	}
	Student(const Student& s1)
	{
		strcpy(m_sName, s1.GetName());
		m_nAge = s1.GetAge();
	}

	int GetAge()
	{
		return m_nAge;
	}

	char * GetName()
	{
		return m_sName;
	}
private:
	char			m_sName[20];
	unsigned int	m_nAge;	
};

int main()
{
	Student s1;

	map<int, Student> m1;
	m1.insert(pair<int, Student>(12, s1("lilin", 3)) );


	
	return 0;
}

这样怎么还是报错啊？
C:\Users\Administrator\Desktop\程序源\1.cpp(31) : error C2662: 'GetName' : cannot convert 'this' pointer from 'const class Student' to 'class Student &'
Conversion loses qualifiers
C:\Users\Administrator\Desktop\程序源\1.cpp(32) : error C2662: 'GetAge' : cannot convert 'this' pointer from 'const class Student' to 'class Student &'
Conversion loses qualifiers
C:\Users\Administrator\Desktop\程序源\1.cpp(54) : error C2064: term does not evaluate to a function
Error executing cl.exe.

1.obj - 3 error(s), 0 warning(s)

[downmooner]

int GetAge() const
    {
        return m_nAge;
    }

    char * GetName() const
    {
        return m_sName;
    }

[pengzhixi]

class Student 
{
public:
    Student()
    {
        strcpy(m_sName, "NULL");
        m_nAge = 0;
    }

    Student(int a)
    {
        m_nAge = a;
    }

    Student(const char*sName, int nAge)
    {
        strcpy(m_sName ,sName);
        m_nAge = nAge;
    }
    Student(const Student& s1)
    {
        strcpy(m_sName, s1.m_sName);
        m_nAge = s1.m_nAge;
    }

    int GetAge()
    {
        return m_nAge;
    }

    char * GetName() 
    {
        return m_sName;
    }
private:
    char            m_sName[20];
    unsigned int    m_nAge;    
};

int main()
{
   // Student s1;

    map<int, Student> m1;
    m1.insert(pair<int,Student>(12, Student("lilin", 3)) );

    system("pause");
    return 0;
}

[树无影]

char * GetName() const
	{
		return m_sName;
	}

这句报错
error C2440: 'return' : cannot convert from 'const char [20]' to 'char *'
怎么改啊？

[pengzhixi]

返回值类型改成 const char*就是了

[树无影]

谢谢各位大侠啦