[Boost-users] [multi-array] [C++ 101] How to write a class (was: I NEED HEMP PLEASEeeeeeeeeeeeeee)

On 4/5/06 4:48 PM, "Karim Bakir" wrote: You should first start by putting in a descriptive subject to your message. A generic "help" sentence, especially one that is misspelled and over-emphasized, is no good. Also, since Boost covers a lot of different code subjects, you should add a tag to the subject specifying the library you have a problem with.

I use multi array boost

But I have problem : - I can't declare a multi array as a member variable , I have the error: unexpected "error C2321: syntax error : unexpected 'boost::extents" When I don' write the keyword "typdef" I have more mistakes.

The actual problem isn't with multi-array; it's that you can't write a class.

//Boost library #include #include <cassert> //Name Space using namespace std; using namespace boost; class MyClass { typedef boost::multi_arrayarray_type_2d;

public:

MyClass(); virtual ~MyClass(); array_type_2d M(boost::extents[10][10]);

};

[TRUNCATE] Data-based members generally cannot be initialized at the declaration level within the class definition. (The exception is for static data member constants of an integer or enumeration type, and they must use the "= Value" syntax.) You should initialize non-static data members within each constructor, hopefully within the initializer list, or within the body if you must. Static data members that don't meet the exception given above have to be initialized like a regular variable, but outside the class definition. //======================================================================== class MyClass2 { boost::multi_array M; static const std::size_t sz = 10u; static float count; public: MyClass2() : M( boost::extents[sz][sz] ) { ++count; } virtual ~MyClass2() { --count; } }; float MyClass2::count( 0.0f ); //======================================================================== -- Daryle Walker Mac, Internet, and Video Game Junkie darylew AT hotmail DOT com