Hello,
Nice to have the list members back on the net,
I have a problem with some Standard template Library code examples.
It looks nice on the paper, but my GCC 3.3.2 womits.
I have consulted a nice tutorial introduction about templates and especially STL,
so the code is from here :
http://www.libertyassociates.com/pages/files/TYCPP4eSource2.zip
Please help here are the error messages:
4eList1910_UNIX.cpp:
In function
`void ShowMap(const std::map<T, A, std::less<_Key>, std::allocator<std::pair<const _Key, _Tp> > >&)':
4eList1910_UNIX.cpp:
107: error:
parse error before `=' token
//
// Display map properties
//
template<class T, class A>
void ShowMap(const map<T, A>& v)
{
for (map<T, A>::const_iterator ci = v.begin(); // line 107
/*=======================!!=========================*/
ci != v.end(); ++ci)
cout << ci->first << ": " << ci->second << "\n";cout << endl; }
4eList1910_UNIX.cpp:
In function
`void ShowMap(const std::map<T, A, std::less<_Key>, std::allocator<std::pair<const _Key, _Tp> > >&)
[with T = std::string, A = Student]':
4eList1910_UNIX.cpp:93: instantiated from here
template<class T, class A> void ShowMap(const map<T, A>& v); // display map properties
typedef map<string, Student> SchoolClass;
ShowMap(MathClass); // Line 93
4eList1910_UNIX.cpp:107: error: `ci' undeclared (first use this function)
4eList1910_UNIX.cpp:107: error: (Each undeclared identifier is reported only
once for each function it appears in.)
g++ -v
Reading specs from /opt/sfw/gcc-3/lib/gcc-lib/i386-pc-solaris2.9/3.3.2/specs
Configured with: ../gcc-3.3.2/configure --prefix=/opt/sfw/gcc-3 --with-ld=/usr/ccs/bin/ld --with-as=/usr/ccs/bin/as --without-gnu-ld --without-gnu-as --enable-shared
Thread model: posix
gcc version 3.3.2
I compiled and linked without any makefile, using these options
g++ -ansi -pedantic -Wall -o 4eList1910_UNIX.out 4eList1910_UNIX.cpp -L /opt/sfw/gcc-3/lib/ -R /opt/sfw/gcc-3/lib/ -lstdc++
obviously the code is not free from warnings and not ANSI compatible, but if I use these options
g++ -o 4eList1910_UNIX.out 4eList1910_UNIX.cpp -L /opt/sfw/gcc-3/lib/ -R /opt/sfw/gcc-3/lib/ -lstdc++
4eList1910_UNIX.cpp: In function `void ShowMap(const std::map<T, A,
std::less<_Key>, std::allocator<std::pair<const _Key, _Tp> > >&)':
4eList1910_UNIX.cpp:107: warning: `std::map<T, A, std::less<_Key>,
std::allocator<std::pair<const _Key, _Tp> > >::const_iterator' is implicitly
a typename
4eList1910_UNIX.cpp:107: warning: implicit typename is deprecated, please see
the documentation for details
without the command line -options -ansi -pedantic -Wall
the code compiles, links and actually runs.
Please help.
How can I improve the code, in order to make it unambiguous for gcc 3.3.2 ?
Yours Sincerely
Morten Gulbrandsen
#include <iostream>
#include <string>
#include <map>
using namespace std;
class Student
{
public:
Student();
Student(const string& name, const int age);
Student(const Student& rhs);
~Student();
void SetName(const string& name);
string GetName() const;
void SetAge(const int age);
int GetAge() const;
Student& operator=(const Student& rhs);
private:
string itsName;
int itsAge;
};
Student::Student()
: itsName("New Student"), itsAge(16)
{}
Student::Student(const string& name, const int age)
: itsName(name), itsAge(age)
{}
Student::Student(const Student& rhs)
: itsName(rhs.GetName()), itsAge(rhs.GetAge())
{}
Student::~Student()
{}
void Student::SetName(const string& name)
{
itsName = name;
}
string Student::GetName() const
{
return itsName;
}
void Student::SetAge(const int age)
{
itsAge = age;
}
int Student::GetAge() const
{
return itsAge;
}
Student& Student::operator=(const Student& rhs)
{
itsName = rhs.GetName();
itsAge = rhs.GetAge();
return *this;
}
ostream& operator<<(ostream& os, const Student& rhs)
{
os << rhs.GetName() << " is " << rhs.GetAge() << " years old";
return os;
}
template<class T, class A>
void ShowMap(const map<T, A>& v); // display map properties
typedef map<string, Student> SchoolClass;
int main()
{
Student Harry("Harry", 18);
Student Sally("Sally", 15);
Student Bill("Bill", 17);
Student Peter("Peter", 16);
SchoolClass MathClass;
MathClass[Harry.GetName()] = Harry;
MathClass[Sally.GetName()] = Sally;
MathClass[Bill.GetName()] = Bill;
MathClass[Peter.GetName()] = Peter;
cout << "MathClass:\n";
ShowMap(MathClass);
cout << "We know that " << MathClass["Bill"].GetName()
<< " is " << MathClass["Bill"].GetAge() << " years old\n";
return 0;
}
//
// Display map properties
//
template<class T, class A>
void ShowMap(const map<T, A>& v)
{
for (map<T, A>::const_iterator ci = v.begin();
ci != v.end(); ++ci)
cout << ci->first << ": " << ci->second << "\n";
cout << endl;
}
/*
g++ -ansi -pedantic -Wall -o 4eList1910_UNIX.out 4eList1910_UNIX.cpp -L /opt/sfw/gcc-3/lib/ -R /opt/sfw/gcc-3/lib/ -lstdc++
4eList1910_UNIX.cpp: In function `void ShowMap(const std::map<T, A,
std::less<_Key>, std::allocator<std::pair<const _Key, _Tp> > >&)':
4eList1910_UNIX.cpp:107: error: parse error before `=' token
4eList1910_UNIX.cpp: In function `void ShowMap(const std::map<T, A,
std::less<_Key>, std::allocator<std::pair<const _Key, _Tp> > >&) [with T =
std::string, A = Student]':
4eList1910_UNIX.cpp:93: instantiated from here
4eList1910_UNIX.cpp:107: error: `ci' undeclared (first use this function)
4eList1910_UNIX.cpp:107: error: (Each undeclared identifier is reported only
once for each function it appears in.)
g++ -v
Reading specs from /opt/sfw/gcc-3/lib/gcc-lib/i386-pc-solaris2.9/3.3.2/specs
Configured with: ../gcc-3.3.2/configure --prefix=/opt/sfw/gcc-3 --with-ld=/usr/ccs/bin/ld --with-as=/usr/ccs/bin/as --without-gnu-ld --without-gnu-as --enable-shared
Thread model: posix
gcc version 3.3.2
*/
