Can Member Variables Be Initialized with Constructor Arguments of the Same Name in C ?

Using Constructor Arguments with the Same Name as Member Variables

Original Question:

Is it permissible under the C standard to initialize member variables using the same name as constructor arguments?

Response:

Yes, the C standard permits this approach. The code initializes member variables according to the names provided in the constructor arguments. The following example illustrates this:

#include <cstdio>
#include <vector>

class Blah {
    std::vector<int> vec;

public:
    Blah(std::vector<int> vec) : vec(vec)
    {}

    void printVec() {
        for (unsigned int i = 0; i < vec.size(); i++)
            printf("%i ", vec.at(i));

        printf("\n");
    }
};

Standard Reference:

The C standard (§12.6.2/7) states that "Names in the expression-list of a mem-initializer are evaluated in the scope of the constructor for which the mem-initializer is specified."

Additional Considerations:

The example also demonstrates that using const std::vector &vec as the parameter type can avoid unnecessary copying of the original vector object.

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