Jonathan Jonathan - 3 months ago 8
C++ Question

No == operator found while comparing structs in C++

Comparing two instances of the following struct, I receive an error:

struct MyStruct1 {
Position(const MyStruct2 &_my_struct_2, const int _an_int = -1) :
my_struct_2(_my_struct_2),
an_int(_an_int)
{}

std::string toString() const;

MyStruct2 my_struct_2;
int an_int;
};


The error is:


error C2678: binary '==' : no operator
found which takes a left-hand operand
of type 'myproj::MyStruct1' (or there
is no acceptable conversion)


Why?

Answer

In C++, structs do not have a comparison operator generated by default. You need to write your own:

bool operator==(const MyStruct1& lhs, const MyStruct1& rhs)
{
    return /* your comparison code goes here */
}
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