Hi Codeforces! I'm a graduate student, and I've been programming as a hobby since I was 11. I started CP last year, and since then, I've been working on a C++ debugging library that can print variables of almost any type, like vectors, maps, tuples, and more. In this blog, I want to share it with you. Link: https://github.com/philip82148/cpp-dump

Simple Usage

Pass variables to the cpp_dump() macro. For more detailed usage, please see README of the repo.
Full Example Code

#include <bits/stdc++.h>
#include "path/to/cpp-dump/cpp-dump.hpp"

int main() {
  std::vector<std::vector<int>> my_vector{{3, 5, 8, 9, 7}, {9, 3, 2, 3, 8}};
  cpp_dump(my_vector);
}

Feature Summary

A Wide Variety of Supported Types Section
Example Code
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Auto Indent Section
Example Code
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Customizable Output Color Section
Example Code
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20+ Manipulators to Change the Display Style Section
Example Code
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• The string representation of variables is similar to JavaScript, Python, and C++ syntax. The output is readable without being overloaded with information. (You can add more details using manipulators if you want.)
• The filename, line number, and function name can be included in the output.
• By using macros, cpp-dump supports user-defined types as well. There is no need to write new functions for printing.

See the Features section of the README for details.

Let's try it!

1. Clone the repo(git clone https://github.com/philip82148/cpp-dump) or download it from Releases.
2. Compile & run the code below to test the library

#include <bitset>
#include <complex>
#include <iostream>
#include <map>
#include <optional>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <tuple>
#include <utility>
#include <variant>
#include <vector>

#include "path/to/cpp-dump/cpp-dump.hpp"
namespace cp = cpp_dump;

int main() {
  bool my_bool = true;
  double my_double = 3.141592;
  int my_int = 65;
  char my_char = 'a', LF_char = '\n';
  std::string my_string = "This is a string.";
  int *int_ptr = &my_int;
  void *void_ptr = &my_int;
  std::vector<std::vector<int>> my_vector{{3, 5, 8, 9, 7}, {9, 3, 2, 3, 8}};
  std::set<char> my_set{'A', 'p', 'p', 'l', 'e'};
  std::map<int, int> my_map{{2, 6}, {4, 6}, {5, 3}};
  std::multiset<char> my_multiset{'A', 'p', 'p', 'l', 'e'};
  std::multimap<int, int> my_multimap{{2, 4}, {4, 6}, {5, 3}, {4, 7}};
  std::pair<int, char> my_pair{8, 'a'};
  std::tuple<int, double, std::string> my_tuple{7, 4.5, "This is a string."};
  std::queue<int> my_queue;
  std::priority_queue<int> my_priority_queue;
  std::stack<int> my_stack;
  for (auto v : {1, 2, 3, 4, 5}) my_queue.push(v), my_priority_queue.push(v), my_stack.push(v);
  std::bitset<8> my_bitset(0x3a);
  std::complex<double> my_complex{1.0, -1.0};
  std::optional<int> my_optional{15};
  std::variant<int, std::string> my_variant{"This is a string."};
  std::vector<std::pair<int, std::string>> vector_of_pairs{{1, "apple"}, {3, "banana"}};

  CPP_DUMP_SET_OPTION(max_line_width, 100);
  CPP_DUMP_SET_OPTION(max_iteration_count, 10);

  std::clog << "\n// Basic Type" << std::endl;
  cpp_dump(my_bool, my_double, my_int), cpp_dump(my_string, my_char, LF_char);
  cpp_dump(int_ptr, void_ptr, nullptr);

  std::clog << "\n// Container" << std::endl;
  cpp_dump(my_vector);

  std::clog << "\n// Set/Map" << std::endl;
  cpp_dump(my_set), cpp_dump(my_map);

  std::clog << "\n// Multiset/Multimap" << std::endl;
  cpp_dump(my_multiset), cpp_dump(my_multimap);

  std::clog << "\n// Tuple" << std::endl;
  cpp_dump(my_tuple), cpp_dump(my_pair);

  std::clog << "\n// FIFO/LIFO" << std::endl;
  cpp_dump(my_queue), cpp_dump(my_priority_queue), cpp_dump(my_stack);

  std::clog << "\n// Other" << std::endl;
  cpp_dump(my_bitset), cpp_dump(my_complex);
  cpp_dump(my_optional, std::nullopt), cpp_dump(my_variant);

  std::clog << "\n// Combination" << std::endl;
  cpp_dump(vector_of_pairs);

  std::vector<std::vector<int>> some_huge_vector(100, std::vector<int>(100));
  std::vector<std::vector<unsigned int>> unsigned_int_vector(100, std::vector<unsigned int>(100));

  for (int i = 0; i < 100; ++i) {
    for (int j = 0; j < 100; ++j) {
      some_huge_vector[i][j] = ((i + 1) * 7 % 19 - 9) * ((j + 1) * 3 % 19 - 9);
      unsigned_int_vector[i][j] = std::abs(some_huge_vector[i][j]);
    }
  }

  std::clog << "\n// Manipulator Test" << std::endl;
  cpp_dump(some_huge_vector | cp::back() | cp::both_ends() | cp::dec(2));
  cpp_dump(some_huge_vector | cp::dec(2) | cp::index());
}

Please see README.md for more detailed information on the installation method.

Recommended usage in competitive programming

cpp_dump(vars...) is long, so let's shorten it to dump(vars...) by macro. For details, see For Competitive Programming Use section of the README.

#define dump(...) cpp_dump(__VA_ARGS__)

News

v0.7.0 released on August 19 has lots of new features.
If you're using an older version, please update it! (For git users, run git pull)

Conclusion

I hope this library helps!
Also, if you could upvote this blog and give a star to the repo, I would really appreciate it.