I tried the following in MSVC7.1 but was told "unable to deduce
template parameter".
template <int L, int M, int T> class Quantity;
template <int L, int M, int T> Quantity<L/2,M/2,T/2> sqrt(const
Quantity<L,M,T> & q);
template <int L, int M, int T>
class Quantity
{public:...
friend Quantity<L/2,M/2,T/2> sqrt<L,M,T>(con st Quantity<L,M,T> & q);
};
template <int L,int M, int T>
Quantity<L/2,M/2,T/2> sqrt(const Quantity<L,M,T> & q)
{
Quantity<L/2,M/2,T/2> q1;
return q1;
};
That's for a unit system operation.
I succeed with return type like <L1+L2,M1+M2,T1 +T2> (For multiply).
Also for pow, I failed. 3 1124
Atlas wrote: I tried the following in MSVC7.1 but was told "unable to deduce template parameter". template <int L, int M, int T> class Quantity; template <int L, int M, int T> Quantity<L/2,M/2,T/2> sqrt(const Quantity<L,M,T> & q); template <int L, int M, int T> class Quantity {public:... friend Quantity<L/2,M/2,T/2> sqrt<L,M,T>(con st Quantity<L,M,T> & q); }; template <int L,int M, int T> Quantity<L/2,M/2,T/2> sqrt(const Quantity<L,M,T> & q) { Quantity<L/2,M/2,T/2> q1; return q1; }; That's for a unit system operation. I succeed with return type like <L1+L2,M1+M2,T1 +T2> (For multiply). Also for pow, I failed.
Compiles fine with VC 8 :)
ben
Atlas wrote: I tried the following in MSVC7.1 but was told "unable to deduce template parameter". template <int L, int M, int T> class Quantity; template <int L, int M, int T> Quantity<L/2,M/2,T/2> sqrt(const Quantity<L,M,T> & q); template <int L, int M, int T> class Quantity {public:... friend Quantity<L/2,M/2,T/2> sqrt<L,M,T>(con st Quantity<L,M,T> & q); }; template <int L,int M, int T> Quantity<L/2,M/2,T/2> sqrt(const Quantity<L,M,T> & q) { Quantity<L/2,M/2,T/2> q1; return q1; }; That's for a unit system operation. I succeed with return type like <L1+L2,M1+M2,T1 +T2> (For multiply). Also for pow, I failed.
L, M, and T in this case are constants, not integer variables. So the
compiler *should* be able to evaluate things like L/2. Apparently
yours does not, so the best solution is to get a better one.
FWIW, Comeau's online C++ compiler accepted the code after I removed
the extra semicolon and the ellipsis.
Kristo
Kristo wrote: Atlas wrote: I tried the following in MSVC7.1 but was told "unable to deduce template parameter". template <int L, int M, int T> class Quantity; template <int L, int M, int T> Quantity<L/2,M/2,T/2> sqrt(const Quantity<L,M,T> & q); template <int L, int M, int T> class Quantity {public:... friend Quantity<L/2,M/2,T/2> sqrt<L,M,T>(con st Quantity<L,M,T> & q); }; template <int L,int M, int T> Quantity<L/2,M/2,T/2> sqrt(const Quantity<L,M,T> & q) { Quantity<L/2,M/2,T/2> q1; return q1; }; That's for a unit system operation. I succeed with return type like <L1+L2,M1+M2,T1 +T2> (For multiply). Also for pow, I failed.
L, M, and T in this case are constants, not integer variables. So the compiler *should* be able to evaluate things like L/2. Apparently yours does not, so the best solution is to get a better one.
FWIW, Comeau's online C++ compiler accepted the code after I removed the extra semicolon and the ellipsis.
Kristo
Thanks you all. To use VC2003, I modified my codes. Simply put,
eliminate the friend declaration. In this way it works, but I have to
implement a lot of seter/geter of my class members. The example codes
listed.
Maybe VC has some special requirements on template friend?
-------
template <int L, int M, int T>
class Quantity
{
public:
};
template <int L,int M, int T>
Quantity<L/2,M/2,T/2> sqrt(const Quantity<L,M,T> & q)
{
Quantity<L/2,M/2,T/2> q1;
return q1;
}
int main()
{
Quantity<0,0,2> q;
Quantity<0,0,1> w = sqrt(q);
return 0;
} This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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