Thread: Weird template compilation error with VisualStudio 2005

Hi,

Just encountered a very weird error while compiling a very simple class template.

This does not compile:

Code:

#ifndef __MATRIX_
#define __MATRIX_

#include <fstream>
#include <iostream>
#include <valarray>

namespace LinearAlgrebra
{

    template<typename T> class Matrix
    {
    public:
	Matrix();
  
    private:
	size_t _nbrows;
	size_t _nbcols;
	
	valarray<T> _elms; // vector of column vectors
	
    }; // end class template
    
};

#endif

with the messages

1>d:\src\pluginlib\inc\LinearAlgebra/Matrix.h(25) : error C2143: syntax error : missing ';' before '<'
1> d:\src\pluginlib\inc\LinearAlgebra/Matrix.h(27) : see reference to class template instantiation 'LinearAlgrebra::Matrix<T>' being compiled
1>d:\src\pluginlib\inc\LinearAlgebra/Matrix.h(25) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>d:\src\pluginlib\inc\LinearAlgebra/Matrix.h(25) : error C2238: unexpected token(s) preceding ';'

Does it somehow not recognize the 'valarray<T>' ? I really don't understand....

Perhaps std::valarray

valarray, like all other elements of the C++ standard library, is in namespace std. You need to write std::valarray.

You also need to include <cstddef> and write std::size_t. That one won't cause compilation errors on most compilers, but it's still needed for your program to be strictly correct.