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Don't do that it is so easy to have incorrect usage.

All your cases can be done using normal syntax in C++.

// int arr[128];
// ZeroArray(arr);

int arr[128] = {0}; // Zero whole array.
// Or better yet use a vector.
std:vector<int>  arr(128); // zero init the vector of 128 elements.
// Or alternatively an array
std::array<int,128> arr(0);

// S s;
// ZeroStruct(s);
S s = S();          // Calls the default constructor for zero initialization.

See:
C++ implicit copy constructor for a class that contains other objects
Proper way to initialize C++ structs
Does a c++ struct have a default constructor?

Don't do that it is so easy to have incorrect usage.

All your cases can be done using normal syntax in C++.

// int arr[128];
// ZeroArray(arr);

int arr[128] = {0}; // Zero whole array.
// Or better yet use a vector.
std:vector<int>  arr(128); // zero init the vector of 128 elements.
// Or alternatively an array
std::array<int,128> arr(0);

// S s;
// ZeroStruct(s);
S s = S();          // Calls the default constructor for zero initialization.

See:
C++ implicit copy constructor for a class that contains other objects
Proper way to initialize C++ structs
Does a c++ struct have a default constructor?

Don't do that it is so easy to have incorrect usage.

All your cases can be done using normal syntax in C++.

// int arr[128];
// ZeroArray(arr);

int arr[128] = {0}; // Zero whole array.
// Or better yet use a vector.
std:vector<int>  arr(128); // zero init the vector of 128 elements.
// Or alternatively an array
std::array<int,128> arr(0);

// S s;
// ZeroStruct(s);
S s = S();          // Calls the default constructor for zero initialization.

See:
C++ implicit copy constructor for a class that contains other objects
Do built-in types have default constructors?
Proper way to initialize C++ structs
Does a c++ struct have a default constructor?

Don't do that it is so easy to have incorrect usage.

All your cases can be done using normal syntax in C++.

// int arr[128];
// ZeroArray(arr);

int arr[128] = {0}; // Zero whole array.
// Or better yet use a vector.
std:vector<int>  arr(128); // zero init the vector of 128 elements.
// Or alternatively an array
std::array<int,128> arr(0);

// S s;
// ZeroStruct(s);
S s = S();          // Calls the default constructor for zero initialization.

See:
C++ implicit copy constructor for a class that contains other objects
Proper way to initialize C++ structs
Does a c++ struct have a default constructor?

Don't do that it is so easy to have incorrect usage.

All your cases can be done using normal syntax in C++.

// int arr[128];
// ZeroArray(arr);
int arr[128] = {0}; // Zero whole array.

// S s;
// ZeroStruct(s);
S s = S{};          // Calls the default constructor for zero initialization.

Don't do that it is so easy to have incorrect usage.

All your cases can be done using normal syntax in C++.

// int arr[128];
// ZeroArray(arr); 

int arr[128] = {0}; // Zero whole array.
// Or better yet use a vector.
std:vector<int>  arr(128); // zero init the vector of 128 elements.
// Or alternatively an array
std::array<int,128> arr(0);

// S s;
// ZeroStruct(s);
S s = S();          // Calls the default constructor for zero initialization.

See:
C++ implicit copy constructor for a class that contains other objects
Do built-in types have default constructors?
Proper way to initialize C++ structs
Does a c++ struct have a default constructor?