Document suggested cleanup approach about uvw HOT 9 CLOSED

#include <uvw.hpp>
#include <crtdbg.h>
#include <iostream>

auto setup_leak_detection() -> void;

auto main() -> int {
    setup_leak_detection();

    // Simple loop
    auto loop = uvw::loop::get_default();

    auto socket = loop->resource<uvw::pipe_handle>();

    loop->walk([](auto&& h) {
        h.close();
    });
}

auto alloc_hook(
   int /*allocType*/,
   void* /*userData*/,
   size_t size,
   int /*blockType*/,
   long request_number,
   unsigned char const* /*filename*/,
   int /*lineNumber*/) -> int {

   // a memory leak can jump around a bit run to run
   // so we define a window around the reported allocation
   // number

   int       nominal_request = 163;
   int       leak_size       = 200;
   int const window_size     = 20;

   if (
      request_number >= nominal_request - window_size &&
      request_number <= nominal_request + window_size && size == leak_size)
   {
      // set a breakpoint here to find the allocation
      int five = 5;
   }

   return true;
}

auto setup_leak_detection() -> void {
   auto initial_flag = _CrtSetDbgFlag(_CRTDBG_REPORT_FLAG);
   _CrtSetDbgFlag(initial_flag | _CRTDBG_LEAK_CHECK_DF);
   _CrtSetAllocHook(alloc_hook);
   _CrtSetReportMode(_CRT_WARN, _CRTDBG_MODE_FILE | _CRTDBG_MODE_DEBUG);
   _CrtSetReportFile(_CRT_WARN, _CRTDBG_FILE_STDOUT);
   _CrtSetReportMode(_CRT_ERROR, _CRTDBG_MODE_FILE | _CRTDBG_MODE_DEBUG);
   _CrtSetReportFile(_CRT_ERROR, _CRTDBG_FILE_STDOUT);
   _CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_FILE | _CRTDBG_MODE_DEBUG);
   _CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDOUT);
}

Detected memory leaks!
Dumping objects ->
{168} normal block at 0x0000019C8710C6C0, 1192 bytes long.
 Data: <h               > 68 DD 97 C5 F7 7F 00 00 01 00 00 00 02 00 00 00
{167} normal block at 0x0000019C870F91B0, 24 bytes long.
 Data: <8               > 38 DD 97 C5 F7 7F 00 00 01 00 00 00 02 00 00 00
{166} normal block at 0x0000019C870E6560, 120 bytes long.
 Data: <0               > 30 DC 97 C5 F7 7F 00 00 CD CD CD CD CD CD CD CD
{165} normal block at 0x0000019C870E3740, 64 bytes long.
 Data: <                > 80 17 9C C5 F7 7F 00 00 00 00 00 00 00 00 00 00
{164} normal block at 0x0000019C870FE130, 16 bytes long.
 Data: <                > 00 00 00 00 00 00 00 00 00 00 00 00 CD CD CD CD
{163} normal block at 0x0000019C87104390, 200 bytes long.
 Data: <                > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Object dump complete.

auto main() -> int {
    setup_leak_detection();

    // Simple loop
    auto loop = uvw::loop::get_default();

    auto socket = loop->resource<uvw::pipe_handle>();

    loop->walk([](auto&& h) {
        h.close();
    });

    loop->run();
}

int main() {
    auto loop = uvw::loop::get_default();
    listen(*loop);
    conn(*loop);
    loop->run();

    loop->walk([](auto&& h) {
        h.close();
    });

    loop->run();   
}