Re: Best practice? Constant number in class
On 4 Apr., 07:34, "nickf3" <nic...@gmail.com> wrote:
unless I actually needed the storage for the member,
I would do something like
template <double ImportantFactor>
class MyClassTmpl {
// use ImportantFactor in template's code
};
[..]
to move the constant at compile/test time.
Or have different specializations
template <>
class MyClassTmpl<3.14> { ... };
template <>
class MyClassTmpl<1.5> { ... };
Or instantiate with different values, etc.
Depends on what's to be done.
Stuffing the magic const into implementation file
always works, but then I forget it's there :)
This ansatz is similarly no valid C++, as an
in-class static member of type double (or other
non-integral, non-enumeration type), which
is immediately initialized in the class.
Non-type template parameter types can be
one of the following (see 14.1/4):
- integral or enumeration type,
- pointer to object or pointer to function,
- reference to object or reference to function,
- pointer to member.
Greetings from Bremen,
Daniel Kr?gler
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