In file included from thread_pool_test.cpp:12:
thread_pool.hpp:225:75: error: ‘is_void_v’ is not a member of ‘std’; did you mean ‘is_void’?
  225 |     template <typename F, typename... A, typename = std::enable_if_t<std::is_void_v<std::invoke_result_t<std::decay_t<F>, std::decay_t<A>...>>>>
      |                                                                           ^~~~~~~~~
      |                                                                           is_void
thread_pool.hpp:225:75: error: ‘is_void_v’ is not a member of ‘std’; did you mean ‘is_void’?
  225 |     template <typename F, typename... A, typename = std::enable_if_t<std::is_void_v<std::invoke_result_t<std::decay_t<F>, std::decay_t<A>...>>>>
      |                                                                           ^~~~~~~~~
      |                                                                           is_void
thread_pool.hpp:225:90: error: ‘invoke_result_t’ is not a member of ‘std’
  225 |     template <typename F, typename... A, typename = std::enable_if_t<std::is_void_v<std::invoke_result_t<std::decay_t<F>, std::decay_t<A>...>>>>
      |                                                                                          ^~~~~~~~~~~~~~~
thread_pool.hpp:225:138: error: pack expansion argument for non-pack parameter ‘_Tp’ of alias template ‘template<bool _Cond, class _Tp> using enable_if_t = typename std::enable_if::type’
  225 |     template <typename F, typename... A, typename = std::enable_if_t<std::is_void_v<std::invoke_result_t<std::decay_t<F>, std::decay_t<A>...>>>>
      |                                                                                                                                          ^~~
In file included from /usr/include/c++/9/bits/move.h:55,
                 from /usr/include/c++/9/bits/nested_exception.h:40,
                 from /usr/include/c++/9/exception:144,
                 from /usr/include/c++/9/ios:39,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/fstream:38,
                 from thread_pool_test.cpp:6:
/usr/include/c++/9/type_traits:2377:24: note: declared here
 2377 |   template<bool _Cond, typename _Tp = void>
      |                        ^~~~~~~~
In file included from thread_pool_test.cpp:12:
thread_pool.hpp:225:143: error: expected unqualified-id before ‘>>’ token
  225 |     template <typename F, typename... A, typename = std::enable_if_t<std::is_void_v<std::invoke_result_t<std::decay_t<F>, std::decay_t<A>...>>>>
      |                                                                                                                                               ^~
thread_pool.hpp:261:60: error: ‘invoke_result_t’ in namespace ‘std’ does not name a template type
  261 |     template <typename F, typename... A, typename R = std::invoke_result_t<std::decay_t<F>, std::decay_t<A>...>, typename = std::enable_if_t<!std::is_void_v<R>>>
      |                                                            ^~~~~~~~~~~~~~~
thread_pool.hpp:261:75: error: expected ‘>’ before ‘<’ token
  261 |     template <typename F, typename... A, typename R = std::invoke_result_t<std::decay_t<F>, std::decay_t<A>...>, typename = std::enable_if_t<!std::is_void_v<R>>>
      |                                                                           ^
thread_pool.hpp:314:32: error: use of deleted function ‘std::atomic<bool>::atomic(const std::atomic<bool>&)’
  314 |     std::atomic<bool> paused = false;
      |                                ^~~~~
In file included from thread_pool.hpp:17,
                 from thread_pool_test.cpp:12:
/usr/include/c++/9/atomic:73:5: note: declared here
   73 |     atomic(const atomic&) = delete;
      |     ^~~~~~
/usr/include/c++/9/atomic:77:15: note:   after user-defined conversion: ‘constexpr std::atomic<bool>::atomic(bool)’
   77 |     constexpr atomic(bool __i) noexcept : _M_base(__i) { }
      |               ^~~~~~
In file included from thread_pool_test.cpp:12:
thread_pool.hpp:411:33: error: use of deleted function ‘std::atomic<bool>::atomic(const std::atomic<bool>&)’
  411 |     std::atomic<bool> running = true;
      |                                 ^~~~
In file included from thread_pool.hpp:17,
                 from thread_pool_test.cpp:12:
/usr/include/c++/9/atomic:73:5: note: declared here
   73 |     atomic(const atomic&) = delete;
      |     ^~~~~~
/usr/include/c++/9/atomic:77:15: note:   after user-defined conversion: ‘constexpr std::atomic<bool>::atomic(bool)’
   77 |     constexpr atomic(bool __i) noexcept : _M_base(__i) { }
      |               ^~~~~~
In file included from thread_pool_test.cpp:12:
thread_pool.hpp:431:37: error: use of deleted function ‘std::atomic<long unsigned int>::atomic(const std::atomic<long unsigned int>&)’
  431 |     std::atomic<ui32> tasks_total = 0;
      |                                     ^
In file included from thread_pool.hpp:17,
                 from thread_pool_test.cpp:12:
/usr/include/c++/9/atomic:824:7: note: declared here
  824 |       atomic(const atomic&) = delete;
      |       ^~~~~~
/usr/include/c++/9/atomic:828:17: note:   after user-defined conversion: ‘constexpr std::atomic<long unsigned int>::atomic(std::atomic<long unsigned int>::__integral_type)’
  828 |       constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
      |                 ^~~~~~
In file included from thread_pool_test.cpp:12:
thread_pool.hpp: In member function ‘thread_pool::ui64 thread_pool::get_tasks_queued() const’:
thread_pool.hpp:78:20: error: ‘scoped_lock’ in namespace ‘std’ does not name a type
   78 |         const std::scoped_lock lock(queue_mutex);
      |                    ^~~~~~~~~~~
thread_pool.hpp:78:15: note: ‘std::scoped_lock’ is only available from C++17 onwards
   78 |         const std::scoped_lock lock(queue_mutex);
      |               ^~~
thread_pool.hpp: In member function ‘void thread_pool::push_task(const F&)’:
thread_pool.hpp:176:24: error: ‘scoped_lock’ in namespace ‘std’ does not name a type
  176 |             const std::scoped_lock lock(queue_mutex);
      |                        ^~~~~~~~~~~
thread_pool.hpp:176:19: note: ‘std::scoped_lock’ is only available from C++17 onwards
  176 |             const std::scoped_lock lock(queue_mutex);
      |                   ^~~
thread_pool.hpp: In member function ‘bool thread_pool::pop_task(std::function<void()>&)’:
thread_pool.hpp:356:20: error: ‘scoped_lock’ in namespace ‘std’ does not name a type
  356 |         const std::scoped_lock lock(queue_mutex);
      |                    ^~~~~~~~~~~
thread_pool.hpp:356:15: note: ‘std::scoped_lock’ is only available from C++17 onwards
  356 |         const std::scoped_lock lock(queue_mutex);
      |               ^~~
thread_pool.hpp: In member function ‘void synced_stream::print(const T& ...)’:
thread_pool.hpp:463:20: error: ‘scoped_lock’ in namespace ‘std’ does not name a type
  463 |         const std::scoped_lock lock(stream_mutex);
      |                    ^~~~~~~~~~~
thread_pool.hpp:463:15: note: ‘std::scoped_lock’ is only available from C++17 onwards
  463 |         const std::scoped_lock lock(stream_mutex);
      |               ^~~
thread_pool.hpp:464:31: warning: fold-expressions only available with ‘-std=c++17’ or ‘-std=gnu++17’
  464 |         (out_stream << ... << items);
      |                               ^~~~~
thread_pool_test.cpp: In function ‘ui32 count_unique_threads()’:
thread_pool_test.cpp:126:10: error: ‘sort’ is not a member of ‘std’; did you mean ‘sqrt’?
  126 |     std::sort(thread_IDs.begin(), thread_IDs.end());
      |          ^~~~
      |          sqrt
thread_pool_test.cpp:127:39: error: ‘unique’ is not a member of ‘std’
  127 |     ui32 unique_threads = (ui32)(std::unique(thread_IDs.begin(), thread_IDs.end()) - thread_IDs.begin());
      |                                       ^~~~~~
thread_pool_test.cpp: In function ‘void check_submit()’:
thread_pool_test.cpp:202:54: error: no matching function for call to ‘thread_pool::submit(check_submit()::<lambda()>)’
  202 |                                      { flag = true; });
      |                                                      ^
In file included from thread_pool_test.cpp:12:
thread_pool.hpp:262:20: note: candidate: ‘template<class F, class ... A, class R> std::future<R> thread_pool::submit(const F&, const A& ...)’
  262 |     std::future<R> submit(const F &task, const A &...args)
      |                    ^~~~~~
thread_pool.hpp:262:20: note:   template argument deduction/substitution failed:
thread_pool_test.cpp:210:43: error: no matching function for call to ‘thread_pool::submit(check_submit()::<lambda(bool*)>, bool*)’
  210 |                                      &flag);
      |                                           ^
In file included from thread_pool_test.cpp:12:
thread_pool.hpp:262:20: note: candidate: ‘template<class F, class ... A, class R> std::future<R> thread_pool::submit(const F&, const A& ...)’
  262 |     std::future<R> submit(const F &task, const A &...args)
      |                    ^~~~~~
thread_pool.hpp:262:20: note:   template argument deduction/substitution failed:
thread_pool_test.cpp:219:52: error: no matching function for call to ‘thread_pool::submit(check_submit()::<lambda(bool*, bool*)>, bool*, bool*)’
  219 |                                      &flag1, &flag2);
      |                                                    ^
In file included from thread_pool_test.cpp:12:
thread_pool.hpp:262:20: note: candidate: ‘template<class F, class ... A, class R> std::future<R> thread_pool::submit(const F&, const A& ...)’
  262 |     std::future<R> submit(const F &task, const A &...args)
      |                    ^~~~~~
thread_pool.hpp:262:20: note:   template argument deduction/substitution failed:
thread_pool_test.cpp:229:39: error: no matching function for call to ‘thread_pool::submit(check_submit()::<lambda()>)’
  229 |                                      });
      |                                       ^
In file included from thread_pool_test.cpp:12:
thread_pool.hpp:262:20: note: candidate: ‘template<class F, class ... A, class R> std::future<R> thread_pool::submit(const F&, const A& ...)’
  262 |     std::future<R> submit(const F &task, const A &...args)
      |                    ^~~~~~
thread_pool.hpp:262:20: note:   template argument deduction/substitution failed:
thread_pool_test.cpp:240:43: error: no matching function for call to ‘thread_pool::submit(check_submit()::<lambda(bool*)>, bool*)’
  240 |                                      &flag);
      |                                           ^
In file included from thread_pool_test.cpp:12:
thread_pool.hpp:262:20: note: candidate: ‘template<class F, class ... A, class R> std::future<R> thread_pool::submit(const F&, const A& ...)’
  262 |     std::future<R> submit(const F &task, const A &...args)
      |                    ^~~~~~
thread_pool.hpp:262:20: note:   template argument deduction/substitution failed:
thread_pool_test.cpp:252:52: error: no matching function for call to ‘thread_pool::submit(check_submit()::<lambda(bool*, bool*)>, bool*, bool*)’
  252 |                                      &flag1, &flag2);
      |                                                    ^
In file included from thread_pool_test.cpp:12:
thread_pool.hpp:262:20: note: candidate: ‘template<class F, class ... A, class R> std::future<R> thread_pool::submit(const F&, const A& ...)’
  262 |     std::future<R> submit(const F &task, const A &...args)
      |                    ^~~~~~
thread_pool.hpp:262:20: note:   template argument deduction/substitution failed:
thread_pool_test.cpp: In function ‘void check_exceptions()’:
thread_pool_test.cpp:443:84: error: no matching function for call to ‘thread_pool::submit(check_exceptions()::<lambda()>)’
  443 |                                  { throw std::runtime_error("Exception thrown!"); });
      |                                                                                    ^
In file included from thread_pool_test.cpp:12:
thread_pool.hpp:262:20: note: candidate: ‘template<class F, class ... A, class R> std::future<R> thread_pool::submit(const F&, const A& ...)’
  262 |     std::future<R> submit(const F &task, const A &...args)
      |                    ^~~~~~
thread_pool.hpp:262:20: note:   template argument deduction/substitution failed:
thread_pool_test.cpp: In function ‘double print_speedup(const std::vector<double>&)’:
thread_pool_test.cpp:883:16: warning: structured bindings only available with ‘-std=c++17’ or ‘-std=gnu++17’
  883 |     const auto [min_time, max_time] = std::minmax_element(std::begin(timings), std::end(timings));
      |                ^
thread_pool_test.cpp:883:44: error: ‘minmax_element’ is not a member of ‘std’
  883 |     const auto [min_time, max_time] = std::minmax_element(std::begin(timings), std::end(timings));
      |                                            ^~~~~~~~~~~~~~
thread_pool_test.cpp: In function ‘std::pair<double, double> analyze(const std::vector<long int>&)’:
thread_pool_test.cpp:904:21: error: missing template arguments before ‘(’ token
  904 |     return std::pair(mean, sd);
      |                     ^
thread_pool_test.cpp: In function ‘void check_performance()’:
thread_pool_test.cpp:1046:38: error: ‘max_element’ is not a member of ‘std’; did you mean ‘tuple_element’?
 1046 |     const double max_speedup = *std::max_element(std::begin(speedups), std::end(speedups));
      |                                      ^~~~~~~~~~~
      |                                      tuple_element
In file included from thread_pool_test.cpp:12:
thread_pool.hpp: In instantiation of ‘void thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = long int; T2 = long int; F = check_parallelize_loop(i32, i32, const ui32&)::<lambda(const i32&, const i32&)>; thread_pool::ui32 = long unsigned int]’:
thread_pool_test.cpp:298:18:   required from here
thread_pool.hpp:147:27: error: use of deleted function ‘std::atomic<long unsigned int>::atomic(const std::atomic<long unsigned int>&)’
  147 |         std::atomic<ui32> blocks_running = 0;
      |                           ^~~~~~~~~~~~~~
In file included from thread_pool.hpp:17,
                 from thread_pool_test.cpp:12:
/usr/include/c++/9/atomic:824:7: note: declared here
  824 |       atomic(const atomic&) = delete;
      |       ^~~~~~
/usr/include/c++/9/atomic:828:17: note:   after user-defined conversion: ‘constexpr std::atomic<long unsigned int>::atomic(std::atomic<long unsigned int>::__integral_type)’
  828 |       constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
      |                 ^~~~~~
In file included from thread_pool_test.cpp:12:
thread_pool.hpp: In instantiation of ‘void thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = random_matrix_generator<T, D>::generate_matrix(const ui64&, const ui64&, const ui32&) [with T = long int; D = std::uniform_int_distribution<long int>; ui64 = long unsigned int; ui32 = long unsigned int]::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]’:
thread_pool_test.cpp:779:13:   required from ‘matrix<T> random_matrix_generator<T, D>::generate_matrix(const ui64&, const ui64&, const ui32&) [with T = long int; D = std::uniform_int_distribution<long int>; ui64 = long unsigned int; ui32 = long unsigned int]’
thread_pool_test.cpp:835:65:   required from here
thread_pool.hpp:147:27: error: use of deleted function ‘std::atomic<long unsigned int>::atomic(const std::atomic<long unsigned int>&)’
  147 |         std::atomic<ui32> blocks_running = 0;
      |                           ^~~~~~~~~~~~~~
In file included from thread_pool.hpp:17,
                 from thread_pool_test.cpp:12:
/usr/include/c++/9/atomic:824:7: note: declared here
  824 |       atomic(const atomic&) = delete;
      |       ^~~~~~
/usr/include/c++/9/atomic:828:17: note:   after user-defined conversion: ‘constexpr std::atomic<long unsigned int>::atomic(std::atomic<long unsigned int>::__integral_type)’
  828 |       constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
      |                 ^~~~~~
In file included from thread_pool_test.cpp:12:
thread_pool.hpp: In instantiation of ‘void thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = add_matrices(const matrix<long int>&, const matrix<long int>&, const ui32&)::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]’:
thread_pool_test.cpp:659:13:   required from ‘matrix<long int> add_matrices(const matrix<long int>&, const matrix<long int>&, const ui32&)’
thread_pool_test.cpp:839:50:   required from here
thread_pool.hpp:147:27: error: use of deleted function ‘std::atomic<long unsigned int>::atomic(const std::atomic<long unsigned int>&)’
  147 |         std::atomic<ui32> blocks_running = 0;
      |                           ^~~~~~~~~~~~~~
In file included from thread_pool.hpp:17,
                 from thread_pool_test.cpp:12:
/usr/include/c++/9/atomic:824:7: note: declared here
  824 |       atomic(const atomic&) = delete;
      |       ^~~~~~
/usr/include/c++/9/atomic:828:17: note:   after user-defined conversion: ‘constexpr std::atomic<long unsigned int>::atomic(std::atomic<long unsigned int>::__integral_type)’
  828 |       constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
      |                 ^~~~~~
In file included from thread_pool_test.cpp:12:
thread_pool.hpp: In instantiation of ‘void thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = matrix<T>::transpose(const ui32&) const [with T = long int; ui32 = long unsigned int]::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]’:
thread_pool_test.cpp:628:13:   required from ‘matrix<T> matrix<T>::transpose(const ui32&) const [with T = long int; ui32 = long unsigned int]’
thread_pool_test.cpp:846:42:   required from here
thread_pool.hpp:147:27: error: use of deleted function ‘std::atomic<long unsigned int>::atomic(const std::atomic<long unsigned int>&)’
  147 |         std::atomic<ui32> blocks_running = 0;
      |                           ^~~~~~~~~~~~~~
In file included from thread_pool.hpp:17,
                 from thread_pool_test.cpp:12:
/usr/include/c++/9/atomic:824:7: note: declared here
  824 |       atomic(const atomic&) = delete;
      |       ^~~~~~
/usr/include/c++/9/atomic:828:17: note:   after user-defined conversion: ‘constexpr std::atomic<long unsigned int>::atomic(std::atomic<long unsigned int>::__integral_type)’
  828 |       constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
      |                 ^~~~~~
In file included from thread_pool_test.cpp:12:
thread_pool.hpp: In instantiation of ‘void thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = multiply_matrices(const matrix<long int>&, const matrix<long int>&, const ui32&)::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]’:
thread_pool_test.cpp:692:13:   required from ‘matrix<long int> multiply_matrices(const matrix<long int>&, const matrix<long int>&, const ui32&)’
thread_pool_test.cpp:853:55:   required from here
thread_pool.hpp:147:27: error: use of deleted function ‘std::atomic<long unsigned int>::atomic(const std::atomic<long unsigned int>&)’
  147 |         std::atomic<ui32> blocks_running = 0;
      |                           ^~~~~~~~~~~~~~
In file included from thread_pool.hpp:17,
                 from thread_pool_test.cpp:12:
/usr/include/c++/9/atomic:824:7: note: declared here
  824 |       atomic(const atomic&) = delete;
      |       ^~~~~~
/usr/include/c++/9/atomic:828:17: note:   after user-defined conversion: ‘constexpr std::atomic<long unsigned int>::atomic(std::atomic<long unsigned int>::__integral_type)’
  828 |       constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
      |                 ^~~~~~
In file included from thread_pool_test.cpp:12:
thread_pool.hpp: In instantiation of ‘void thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = random_matrix_generator<T, D>::generate_matrix(const ui64&, const ui64&, const ui32&) [with T = double; D = std::uniform_real_distribution<double>; ui64 = long unsigned int; ui32 = long unsigned int]::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]’:
thread_pool_test.cpp:779:13:   required from ‘matrix<T> random_matrix_generator<T, D>::generate_matrix(const ui64&, const ui64&, const ui32&) [with T = double; D = std::uniform_real_distribution<double>; ui64 = long unsigned int; ui32 = long unsigned int]’
thread_pool_test.cpp:933:68:   required from here
thread_pool.hpp:147:27: error: use of deleted function ‘std::atomic<long unsigned int>::atomic(const std::atomic<long unsigned int>&)’
  147 |         std::atomic<ui32> blocks_running = 0;
      |                           ^~~~~~~~~~~~~~
In file included from thread_pool.hpp:17,
                 from thread_pool_test.cpp:12:
/usr/include/c++/9/atomic:824:7: note: declared here
  824 |       atomic(const atomic&) = delete;
      |       ^~~~~~
/usr/include/c++/9/atomic:828:17: note:   after user-defined conversion: ‘constexpr std::atomic<long unsigned int>::atomic(std::atomic<long unsigned int>::__integral_type)’
  828 |       constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
      |                 ^~~~~~
In file included from thread_pool_test.cpp:12:
thread_pool.hpp: In instantiation of ‘void thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = add_matrices(const matrix<double>&, const matrix<double>&, const ui32&)::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]’:
thread_pool_test.cpp:659:13:   required from ‘matrix<double> add_matrices(const matrix<double>&, const matrix<double>&, const ui32&)’
thread_pool_test.cpp:950:59:   required from here
thread_pool.hpp:147:27: error: use of deleted function ‘std::atomic<long unsigned int>::atomic(const std::atomic<long unsigned int>&)’
  147 |         std::atomic<ui32> blocks_running = 0;
      |                           ^~~~~~~~~~~~~~
In file included from thread_pool.hpp:17,
                 from thread_pool_test.cpp:12:
/usr/include/c++/9/atomic:824:7: note: declared here
  824 |       atomic(const atomic&) = delete;
      |       ^~~~~~
/usr/include/c++/9/atomic:828:17: note:   after user-defined conversion: ‘constexpr std::atomic<long unsigned int>::atomic(std::atomic<long unsigned int>::__integral_type)’
  828 |       constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
      |                 ^~~~~~
In file included from thread_pool_test.cpp:12:
thread_pool.hpp: In instantiation of ‘void thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = matrix<T>::transpose(const ui32&) const [with T = double; ui32 = long unsigned int]::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]’:
thread_pool_test.cpp:628:13:   required from ‘matrix<T> matrix<T>::transpose(const ui32&) const [with T = double; ui32 = long unsigned int]’
thread_pool_test.cpp:951:52:   required from here
thread_pool.hpp:147:27: error: use of deleted function ‘std::atomic<long unsigned int>::atomic(const std::atomic<long unsigned int>&)’
  147 |         std::atomic<ui32> blocks_running = 0;
      |                           ^~~~~~~~~~~~~~
In file included from thread_pool.hpp:17,
                 from thread_pool_test.cpp:12:
/usr/include/c++/9/atomic:824:7: note: declared here
  824 |       atomic(const atomic&) = delete;
      |       ^~~~~~
/usr/include/c++/9/atomic:828:17: note:   after user-defined conversion: ‘constexpr std::atomic<long unsigned int>::atomic(std::atomic<long unsigned int>::__integral_type)’
  828 |       constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
      |                 ^~~~~~
In file included from thread_pool_test.cpp:12:
thread_pool.hpp: In instantiation of ‘void thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = multiply_matrices(const matrix<double>&, const matrix<double>&, const ui32&)::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]’:
thread_pool_test.cpp:692:13:   required from ‘matrix<double> multiply_matrices(const matrix<double>&, const matrix<double>&, const ui32&)’
thread_pool_test.cpp:952:64:   required from here
thread_pool.hpp:147:27: error: use of deleted function ‘std::atomic<long unsigned int>::atomic(const std::atomic<long unsigned int>&)’
  147 |         std::atomic<ui32> blocks_running = 0;
      |                           ^~~~~~~~~~~~~~
In file included from thread_pool.hpp:17,
                 from thread_pool_test.cpp:12:
/usr/include/c++/9/atomic:824:7: note: declared here
  824 |       atomic(const atomic&) = delete;
      |       ^~~~~~
/usr/include/c++/9/atomic:828:17: note:   after user-defined conversion: ‘constexpr std::atomic<long unsigned int>::atomic(std::atomic<long unsigned int>::__integral_type)’
  828 |       constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
      |                 ^~~~~~
In file included from thread_pool_test.cpp:12:
thread_pool.hpp: At global scope:
thread_pool.hpp:172:10: error: ‘void thread_pool::push_task(const F&) [with F = thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = long int; T2 = long int; F = check_parallelize_loop(i32, i32, const ui32&)::<lambda(const i32&, const i32&)>; thread_pool::ui32 = long unsigned int]::<lambda()>]’, declared using local type ‘const thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = long int; T2 = long int; F = check_parallelize_loop(i32, i32, const ui32&)::<lambda(const i32&, const i32&)>; thread_pool::ui32 = long unsigned int]::<lambda()>’, is used but never defined [-fpermissive]
  172 |     void push_task(const F &task)
      |          ^~~~~~~~~
thread_pool.hpp:172:10: error: ‘void thread_pool::push_task(const F&) [with F = thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = random_matrix_generator<T, D>::generate_matrix(const ui64&, const ui64&, const ui32&) [with T = long int; D = std::uniform_int_distribution<long int>; ui64 = long unsigned int; ui32 = long unsigned int]::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]::<lambda()>]’, declared using local type ‘const thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = random_matrix_generator<T, D>::generate_matrix(const ui64&, const ui64&, const ui32&) [with T = long int; D = std::uniform_int_distribution<long int>; ui64 = long unsigned int; ui32 = long unsigned int]::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]::<lambda()>’, is used but never defined [-fpermissive]
thread_pool.hpp:172:10: error: ‘void thread_pool::push_task(const F&) [with F = thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = add_matrices(const matrix<long int>&, const matrix<long int>&, const ui32&)::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]::<lambda()>]’, declared using local type ‘const thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = add_matrices(const matrix<long int>&, const matrix<long int>&, const ui32&)::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]::<lambda()>’, is used but never defined [-fpermissive]
thread_pool.hpp:172:10: error: ‘void thread_pool::push_task(const F&) [with F = thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = matrix<T>::transpose(const ui32&) const [with T = long int; ui32 = long unsigned int]::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]::<lambda()>]’, declared using local type ‘const thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = matrix<T>::transpose(const ui32&) const [with T = long int; ui32 = long unsigned int]::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]::<lambda()>’, is used but never defined [-fpermissive]
thread_pool.hpp:172:10: error: ‘void thread_pool::push_task(const F&) [with F = thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = multiply_matrices(const matrix<long int>&, const matrix<long int>&, const ui32&)::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]::<lambda()>]’, declared using local type ‘const thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = multiply_matrices(const matrix<long int>&, const matrix<long int>&, const ui32&)::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]::<lambda()>’, is used but never defined [-fpermissive]
thread_pool.hpp:172:10: error: ‘void thread_pool::push_task(const F&) [with F = thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = random_matrix_generator<T, D>::generate_matrix(const ui64&, const ui64&, const ui32&) [with T = double; D = std::uniform_real_distribution<double>; ui64 = long unsigned int; ui32 = long unsigned int]::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]::<lambda()>]’, declared using local type ‘const thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = random_matrix_generator<T, D>::generate_matrix(const ui64&, const ui64&, const ui32&) [with T = double; D = std::uniform_real_distribution<double>; ui64 = long unsigned int; ui32 = long unsigned int]::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]::<lambda()>’, is used but never defined [-fpermissive]
thread_pool.hpp:172:10: error: ‘void thread_pool::push_task(const F&) [with F = thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = add_matrices(const matrix<double>&, const matrix<double>&, const ui32&)::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]::<lambda()>]’, declared using local type ‘const thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = add_matrices(const matrix<double>&, const matrix<double>&, const ui32&)::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]::<lambda()>’, is used but never defined [-fpermissive]
thread_pool.hpp:172:10: error: ‘void thread_pool::push_task(const F&) [with F = thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = matrix<T>::transpose(const ui32&) const [with T = double; ui32 = long unsigned int]::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]::<lambda()>]’, declared using local type ‘const thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = matrix<T>::transpose(const ui32&) const [with T = double; ui32 = long unsigned int]::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]::<lambda()>’, is used but never defined [-fpermissive]
thread_pool.hpp:172:10: error: ‘void thread_pool::push_task(const F&) [with F = thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = multiply_matrices(const matrix<double>&, const matrix<double>&, const ui32&)::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]::<lambda()>]’, declared using local type ‘const thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = int; T2 = long unsigned int; F = multiply_matrices(const matrix<double>&, const matrix<double>&, const ui32&)::<lambda(const ui64&, const ui64&)>; thread_pool::ui32 = long unsigned int]::<lambda()>’, is used but never defined [-fpermissive]
thread_pool.hpp:172:10: warning: ‘void thread_pool::push_task(const F&) [with F = thread_pool::parallelize_loop(const T1&, const T2&, const F&, thread_pool::ui32) [with T1 = long int; T2 = long int; F = check_parallelize_loop(i32, i32, const ui32&)::<lambda(const i32&, const i32&)>]::<lambda()>]’ used but never defined