Hi Chris
some points
a. with upcoming c++0X there was a proposal to have values initialized in the class declaration, so that will cover your case, right? Correct, I posted on the gcc list about N2756, but the implementation may take a couple of years and not all compilers will have it. I made
Andrey Tcherepanov wrote: this class in the meantime. Also C++0x will handle non-const cases.
b. every time when you introduce new instatiation of template, it will make another class. Which (IIUC) will make _width and _heigh not comparable unless you introduce some logic to do so.
Didn't think of that, haven't used it like that yet. Only simple cases.
c. (MvHO) I don't find it improving readability at all... :)
It's awkward looking. I find it more useful for variables I forget to initialize in the constructor, or have many constructors. I don't think that gcc will warn you on this. Makes things safe for me until N2756 comes out.
Regards, Andrey
On Fri, 14 Nov 2008 11:04:20 -0700, Chris <indy271828@sympatico.ca> wrote:
Hi, did anyone ever suggest a template class which initializes a variable to a certain value? (see example) Is this too trivial? This is useful to prevent uninitialized values in objects.
class A { defaulted<int, 1280> _width; defaulted<int, 1024 > _height; defaulted<int, 0> _depth; };
template <typename TYPE, TYPE value> class defaulted { public: defaulted() : _t(value) { } defaulted(const TYPE & value2) : _t(value2) { }
operator TYPE & () { return _t; } TYPE * operator & () { return &_t; } const TYPE * operator & () const { return &_t; } operator const TYPE & () const { return _t; } TYPE & operator =(const TYPE & other) { _t = other; return _t; } private: TYPE _t; };
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