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Fix bug in dep resolution when requesting a "const T*" #347

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marcobergamin
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Hello,
I have fixed a bug in dependency resolution when requesting a "const T*" after injecting a "T*" as dependency.

Before this fix, if a T* was injected as dependency, requesting a const T* will result in a invalid nullptr.
The dependency resolution of objects passed by reference is not affected by this problem.

I have added four tests:

  • dependencies_with_reference
  • dependencies_with_const_reference
  • dependencies_with_pointer
  • dependencies_with_const_pointer (this test fails without the fix)

I am new to TMP and this is my first contribute in general so I hope I didn't do anything wrong.

…g a "T*"

Before this fix, if a T* was injected as depedency, requesting a const T* will result in a invalid nullptr.
Four unit tests added.
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