template< typename T > constexpr T invalidFieldValue( const T & ) {
    using ValueType = typename T::Value;
    using UnderlyingType = typename std::underlying_type< ValueType >::value;

    return static_cast< T >( std::numeric_limits< UnderlyingType >::max( ) );
}

struct MediaType {
  enum class Value { XXXX };
};

template< typename T > constexpr T invalidFieldValue( const T & ) {
    using UnderlyingType = typename std::underlying_type< T >::type;

    return static_cast< T >( std::numeric_limits< UnderlyingType >::max( ) );
}

from itertools import product

def is_valid_cell(coords, size):
    fila, col = coords
    n_filas, n_columnas = size
    return 0 <= fila < n_filas and 0 <= col < n_columnas

def get_neighboor_cells(coords, size):
    fila, col = coords
    neighboor_cells = []
    for dx, dy in product((-1, 0, 1), (-1, 0, 1)):
        if dx==0 and dy==0:
            continue
        vecino = (fila+dx, col+dy)
        if is_valid_cell(vecino, size):
            neighboor_cells.append(vecino)
    return neighboor_cells

for dx, dy in [(-1, -1), (-1, 0), (-1, 1), (0, -1), (0, 1), (1, -1), (1, 0), (1, 1)]:

UnhandledPromiseRejectionWarning: MongooseError: Operation `chats.insertMany()` buffering timed out after 10000ms
at Timeout.<anonymous> (/app/node_modules/mongoose/lib/drivers/node-mongodb-native/collection.js:185:20)
at listOnTimeout (internal/timers.js:555:17)
at processTimers (internal/timers.js:498:7)
(node:21) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection,…