Move destructor into a new cpp file

ThreadPool.cpp

@@ -0,0 +1,13 @@
+#include "ThreadPool.hpp"
+
+// the destructor joins all threads
+ThreadPool::~ThreadPool() {
+	{
+		std::unique_lock<std::mutex> lock(queue_mutex);
+		stop = true;
+	}
+	condition.notify_all();
+	for (std::thread& worker : workers) {
+		worker.join();
+	}
+}

ThreadPool.hpp

@@ -77,16 +77,4 @@ auto ThreadPool::enqueue(F&& f, Args&&... args)
     return res;
 }
 
-// the destructor joins all threads
-ThreadPool::~ThreadPool()
-{
-    {
-        std::unique_lock<std::mutex> lock(queue_mutex);
-        stop = true;
-    }
-    condition.notify_all();
-    for(std::thread &worker: workers)
-        worker.join();
-}
-
 #endif

meson.build

@@ -2,9 +2,12 @@ project('ThreadPool', ['cpp'], default_options : ['cpp_std=c++17'])
 
 threads_dep = dependency('threads')
 
-test('Example', executable('example', sources : ['example.cpp'], dependencies : [threads_dep]))
+lib = static_library('ThreadPool', 'ThreadPool.cpp')
+
+test('Example', executable('example', sources : ['example.cpp'], dependencies : [threads_dep],
+                           link_with : lib))
 
 install_headers('ThreadPool.hpp')
 
 inc = include_directories('.')
-threadpool_dep = declare_dependency(include_directories : inc)
+threadpool_dep = declare_dependency(include_directories : inc, link_with : lib)