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#include <iostream>
#include <assert.h>
 
using namespace std;
 
template<typename T>
struct Array
{
	Array(uint32_t w, uint32_t h)
		: width(w)
		, height(h)
	{
		buffer = new T[w*h];
 
		int k = 0;
		for (int i = 0; i < width; i++)
		{
			for (int j = 0; j < height; j++)
			{
				buffer[i*height + j] = k++;
			}
		}
	}
 
	T get(uint32_t i, uint32_t j) const
	{
		return buffer[i * height + j];
	}
 
private:
	T* buffer;
	uint32_t width;
	uint32_t height;
};
 
#define a[] ()
int main() {
	Array<int> a(20, 5);
	assert(a.get(0,0) == 0);
	assert(a.get(0,5) == 5);
	assert(a.get(19,4) == 99);
	return 0;
}

prog.cpp:36:10: warning: ISO C++11 requires whitespace after the macro name
 #define a[] ()
          ^
prog.cpp: In function 'int main()':
prog.cpp:36:10: error: expected unqualified-id before '[' token
 #define a[] ()
          ^
prog.cpp:38:13: note: in expansion of macro 'a'
  Array<int> a(20, 5);
             ^
In file included from prog.cpp:2:0:
prog.cpp: In lambda function:
prog.cpp:39:10: error: expected '{' before '.' token
  assert(a.get(0,0) == 0);
          ^
prog.cpp: In function 'int main()':
prog.cpp:39:11: error: 'struct main()::<lambda()>' has no member named 'get'
  assert(a.get(0,0) == 0);
           ^
prog.cpp: In lambda function:
prog.cpp:40:10: error: expected '{' before '.' token
  assert(a.get(0,5) == 5);
          ^
prog.cpp: In function 'int main()':
prog.cpp:40:11: error: 'struct main()::<lambda()>' has no member named 'get'
  assert(a.get(0,5) == 5);
           ^
prog.cpp: In lambda function:
prog.cpp:41:10: error: expected '{' before '.' token
  assert(a.get(19,4) == 99);
          ^
prog.cpp: In function 'int main()':
prog.cpp:41:11: error: 'struct main()::<lambda()>' has no member named 'get'
  assert(a.get(19,4) == 99);
           ^

Standard output is empty