I am getting a compile error setting a 2D array class member in the constuctor:
#include <queue>
using namespace std;
#define N 11
struct Elem {
Elem(uint32_t row, uint32_t col)
: row_(row), col_(col)
{ }
uint32_t row_, col_;
};
class Mycomp {
public:
Mycomp(int arr[][N])
{
arr_ = arr;
}
bool operator() (const Elem &lhs, const Elem &rhs)
{
return arr_[lhs.row_][lhs.col_] > arr_[rhs.row_][rhs.col_];
}
int arr_[][N];
};
int *mergeKArrays(int arr[][N], int k)
{
Mycomp mycomp(arr);
priority_queue<Elem, vector<Elem>, Mycomp> pq(mycomp);
for (uint32_t i = 0; i < k; ++i) {
pq.push(Elem(i, 0));
}
return (int *) arr;
}
int main() { }
I am getting the following error:
./mergek.cc: In constructor ‘Mycomp::Mycomp(int (*)[11])’:
./mergek.cc:23:22: error: incompatible types in assignment of ‘int (*)[11]’ to ‘int [0][11]’
arr_ = arr;
^
I have tried different variations, eg "&arr_[0] = arr;" did not work.
Thank you, Ahmed.
Try to avoid using C style arrays and start using C++ containers like std::vectors, std::array, std::maps, etc.
In your code you tried to directly assign a array, which is not according to the rules and hence error would be lvalue must be modifiable value.
This problem can be rectified by visiting error : expression must be a modifiable lvalue
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