0031214: Coding - minor improvements of opencascade::handle class template

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Date Submitted

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0031214

Open CASCADE

[OCCT] OCCT:Coding

public

2019-12-03 12:23

Reporter

tizmaylo

Assigned To

kgv

Priority

normal

Severity

minor

Status

new

Resolution

open

Platform

OS Version

Product Version

Target Version

[OCCT] 7.5.0*

Fixed in Version

Summary

0031214: Coding - minor improvements of opencascade::handle class template

Description

A strange compilation error is issued when the template argument T of the opencascade::handle<T> class template is not derived from Standard_Transient. It would be nice to add a static assertion to the opencascade::handle<T> class template to make error message clearer.
A strange behavior of the opencascade::handle<T> class template is observed with incomplete type T. It looks like that no compilation error is issued even when destructor of opencascade::handle<T>::~handle is called for incomplete T.
It may be useful to add overloads that take an object of the type std::nullptr_t as an argument for constructor, assignment operator and reset() method of the opencascade::handle<T> class template using compilers that support C++11 and higher. nullptr may be used as a default argument for such overload of the reset() method.
There is no operator ->* in the opencascade::handle<T> class template. It may be useful in operations with pointers to methods of the class T. Currently the following code
```
(aHandle.get()->*aPointerToMethod)(aMethodArguments...);
```
should be written instead of
```
(aHandle->*aPointerToMethod)(aMethodArguments...);
```

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