Template problem ... Post: 302239595

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Top Forums Programming Template problem ... Post 302239595 by spirtle on Wednesday 24th of September 2008 04:52:56 AM

09-24-2008

Registered User

You didn't post the code that doesn't work, but I guess that you want to define the method template in a separate file rather than in the definition of the class, as one often does for normal class methods.
Short answer; you can't.

There is, no doubt, a better explanation in a text book somewhere, but here goes...
Templates are not like normal code; you cannot define them where ever you like. When the compiler sees your call to

Code:

int a;
Base_class::fun(a,check);

here is no method with signature

Code:

fun(int, string&);

so it has to create one from the template you supplied. This means that the compiler has to be able to see the both the template (so it knows how to build the function) and the call (so it knows what types to build the function with) at the same time. So the template and the code calling the method must be in the same compilation unit.
You don't have to have the method template defined inline, but you must have it defined where the class is defined.

spirtle

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std::slice_array

std::slice_array< _Tp >(3)				     Library Functions Manual					std::slice_array< _Tp >(3)

NAME

       std::slice_array< _Tp > -

SYNOPSIS

   Public Types
       typedef _Tp value_type

   Public Member Functions
       slice_array (const slice_array &)
       void operator%= (const valarray< _Tp > &) const
       template<class _Dom > void operator%= (const _Expr< _Dom, _Tp > &) const
       void operator&= (const valarray< _Tp > &) const
       template<class _Dom > void operator&= (const _Expr< _Dom, _Tp > &) const
       void operator*= (const valarray< _Tp > &) const
       template<class _Dom > void operator*= (const _Expr< _Dom, _Tp > &) const
       void operator+= (const valarray< _Tp > &) const
       template<class _Dom > void operator+= (const _Expr< _Dom, _Tp > &) const
       void operator-= (const valarray< _Tp > &) const
       template<class _Dom > void operator-= (const _Expr< _Dom, _Tp > &) const
       void operator/= (const valarray< _Tp > &) const
       template<class _Dom > void operator/= (const _Expr< _Dom, _Tp > &) const
       void operator<<= (const valarray< _Tp > &) const
       template<class _Dom > void operator<<= (const _Expr< _Dom, _Tp > &) const
       slice_array & operator= (const slice_array &)
       void operator= (const valarray< _Tp > &) const
       void operator= (const _Tp &) const
       template<class _Dom > void operator= (const _Expr< _Dom, _Tp > &) const
       void operator>>= (const valarray< _Tp > &) const
       template<class _Dom > void operator>>= (const _Expr< _Dom, _Tp > &) const
       void operator^= (const valarray< _Tp > &) const
       template<class _Dom > void operator^= (const _Expr< _Dom, _Tp > &) const
       void operator|= (const valarray< _Tp > &) const
       template<class _Dom > void operator|= (const _Expr< _Dom, _Tp > &) const

   Friends
       class valarray< _Tp >

Detailed Description
   template<class _Tp>class std::slice_array< _Tp >
       Reference to one-dimensional subset of an array.

       A slice_array is a reference to the actual elements of an array specified by a slice. The way to get a slice_array is to call
       operator[](slice) on a valarray. The returned slice_array then permits carrying operations out on the referenced subset of elements in the
       original valarray. For example, operator+=(valarray) will add values to the subset of elements in the underlying valarray this slice_array
       refers to.

       Parameters:
	   Tp Element type.

       Definition at line 80 of file valarray.

Author
       Generated automatically by Doxygen for libstdc++ from the source code.

libstdc++							  Tue Jun 10 2014					std::slice_array< _Tp >(3)