error C2679 数据结构与算法第三版习题1.15
《数据结构与算法分析 第三版 C++描述》习题1.15
运行时候出现如下问题：
1>f:\c workspace\111030_chapter1answersheet_dsaa\111030_chapter1answersheet_dsaa\answersheet_dsaa.cpp(158) : error C2679: binary '=' : no operator found which takes a right-hand operand of type 'const Employee' (or there is no acceptable conversion)
1> d:\software\microsoft visual studio 2008\vc\include\xstring(914): could be 'std::basic_string<_Elem,_Traits,_Ax> &std::basic_string<_Elem,_Traits,_Ax>::operator =(const std::basic_string<_Elem,_Traits,_Ax> &)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>,
1> _Ax=std::allocator<char>
1> ]
1> d:\software\microsoft visual studio 2008\vc\include\xstring(919): or 'std::basic_string<_Elem,_Traits,_Ax> &std::basic_string<_Elem,_Traits,_Ax>::operator =(const _Elem *)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>,
1> _Ax=std::allocator<char>
1> ]
1> d:\software\microsoft visual studio 2008\vc\include\xstring(924): or 'std::basic_string<_Elem,_Traits,_Ax> &std::basic_string<_Elem,_Traits,_Ax>::operator =(_Elem)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>,
1> _Ax=std::allocator<char>
1> ]
1> while trying to match the argument list '(std::string, const Employee)'
1>Build log was saved at "file://f:\C Workspace\111030_Chapter1AnswerSheet_DSAA\111030_Chapter1AnswerSheet_DSAA\Debug\BuildLog.htm"
这应该是一个很简单的问题。本人新手，实在是看不懂！望大侠们指教！
自己写的源程序
#include <string>
#include <iostream>
#include <vector>
using namespace std;
string getLast( const string & nm );
class Employee
{
public:
void setValue( const string & n, double s )
{
name = n;
salary = s;
}
const string & getName() const
{
return name;
}
private:
string name;
double salary;
};
/*
const Employee & Employee::operator =(const Employee &rhs)
{
if ( this != &rhs )
{
name = *rhs.name;
salary = *rhs.salary;
}
return *this;
}
*/
template <typename Object, typename Comparator>
const Object & findMax( const vector<Object> & arr, Comparator isLessThan )
{
int maxIndex = 0;
for ( int i = 1; i < arr.size(); i++ )
if ( isLessionThan( arr[ maxIndex ], arr[ i ] ) )
maxIndex = i;
return arr[ maxIndex ];
}
class EmployeeLastNameCompare
{
public:
bool operator() ( const Employee & lhs, const Employee & rhs ) const
{
return getLast( lhs.getName() ) < getLast( rhs.getName() );
}
};
string getLast( const string & name )
{
string last;
int blankPosition = name.find( " " );
last = name.substr( blankPosition + 1, name.size() );
return last;
}
int main()
{
vector<Employee> v(3);
string str = "";
v[0].setValue( "George Bush", 400000.00 );
v[1].setValue( "Bill Gates", 2000000000000.00 );
v[2].setValue( "Dr. Phil", 1300000000.00 );
str = ( findMax( v, EmployeeLastNameCompare() ) );
cout << str << endl;
return 0;
}
[解决办法]
改好了，有问题加我Q: 506341588
#include <string>#include <iostream>#include <vector>using namespace std;string getLast( const string & nm );class Employee{public: void setValue( const string & n, double s ) { name = n; salary = s; } const string& getName() const { return name; } const double& getSalary() const { return salary; } const Employee& operator =(const Employee &rhs); private: string name; double salary;};ostream& operator << (ostream &out, const Employee &rhs){ out << rhs.getName() << " (" << rhs.getSalary() << ")"; return out;}const Employee & Employee::operator =(const Employee &rhs){ if ( this != &rhs ) { name = rhs.name; salary = rhs.salary; } return *this;}template <typename Object, typename Comparator>const Object & findMax( const vector<Object> & arr, Comparator cmp ){ int maxIndex = 0; for ( int i = 1; i < arr.size(); i++ ) if ( cmp.isLessionThan( arr[ maxIndex ], arr[ i ] ) ) maxIndex = i; return arr[ maxIndex ];}class EmployeeLastNameCompare{public: bool isLessionThan( const Employee & lhs, const Employee & rhs ) const { return getLast( lhs.getName() ) < getLast( rhs.getName() ); } };string getLast( const string & name ){ string last; int blankPosition = name.find( " " ); last = name.substr( blankPosition + 1, name.size() ); return last;}int main(){ vector<Employee> v(3); v[0].setValue( "George Bush", 400000.00 ); v[1].setValue( "Bill Gates", 2000000000000.00 ); v[2].setValue( "Dr. Phil", 1300000000.00 ); cout << findMax( v, EmployeeLastNameCompare() ) << endl; return 0;}
[解决办法]
#include <string>#include <iostream>#include <vector>using namespace std;string getLast( const string & nm );class Employee{public: void setValue( const string & n, double s ) { name = n; salary = s; } const string& getName() const { return name; } const double& getSalary() const { return salary; } const Employee& operator =(const Employee &rhs); private: string name; double salary;};ostream& operator << (ostream &out, const Employee &rhs){ out << rhs.getName() << " (" << rhs.getSalary() << ")"; return out;}const Employee & Employee::operator =(const Employee &rhs){ if ( this != &rhs ) { name = rhs.name; salary = rhs.salary; } return *this;}template <typename Object, typename Comparator>const Object & findMax( const vector<Object> & arr, Comparator cmp ){ int maxIndex = 0; for ( int i = 1; i < arr.size(); i++ ) if ( cmp.isLessionThan( arr[ maxIndex ], arr[ i ] ) ) maxIndex = i; return arr[ maxIndex ];}class EmployeeLastNameCompare{public: bool isLessionThan( const Employee & lhs, const Employee & rhs ) const { return getLast( lhs.getName() ) < getLast( rhs.getName() ); } };string getLast( const string & name ){ string last; int blankPosition = name.find( " " ); last = name.substr( blankPosition + 1, name.size() ); return last;}int main(){ vector<Employee> v(3); v[0].setValue( "George Bush", 400000.00 ); v[1].setValue( "Bill Gates", 2000000000000.00 ); v[2].setValue( "Dr. Phil", 1300000000.00 ); cout << findMax( v, EmployeeLastNameCompare() ) << endl; return 0;}