pmem::obj::operator==()

[Supriya Mishra SVNIT]

Hi,

I am trying to check if two persistent_ptr are equal or not using == operator. Here is the sample code-

using namespace pmem;

using namespace pmem::obj;

persistent_ptr<Treenode>child;

persistent_ptr<Treenode>root;

if(operator==(child==root)){

     \\do something..

}

I am getting the following error-

error: no matching function for call to ‘operator==(__gnu_cxx::__alloc_traits<std::allocator<pmem::obj::persistent_ptr<PRnode> >, pmem::obj::persistent_ptr<PRnode> >::value_type&, PRnode*)’

126 |                         if (operator==(parentPtr->childPtrs[i],this)) {
      |                             ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/11/bits/stl_algobase.h:64,

Can somebody help me figure out how to resolve this error?

Best regards,

Supriya

[Igor]

Hi,

Since persistent_ptr overloads the comparison operator, you should just call:
if (child == root) {
    // do something
}

You can find more information on how operator overloading works here: https://en.cppreference.com/w/cpp/language/operators

Best regards,
Igor

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[Supriya Mishra SVNIT]

Hi Igor,

Thanks a lot for the help. I tried it and it worked.

Best regards,

Supriya