Run clang-format

ch2/accumulate.cpp

@@ -1,69 +1,69 @@
 #include <algorithm>
 #include <functional>
 #include <iostream>
-#include <vector>
+#include <numeric>  // std::accumulate
 #include <thread>
-#include <numeric> // std::accumulate
+#include <vector>
 
 template <typename Iterator, typename T>
-struct accumulate_block
-{
-    void operator()(Iterator first, Iterator last, T& result)
-    {
-        result = std::accumulate(first,last,result);
-    }
+struct accumulate_block {
+  void operator()(Iterator first, Iterator last, T& result)
+  {
+    result = std::accumulate(first, last, result);
+  }
 };
 
 template <typename Iterator, typename T>
-T parallel_accumulate(Iterator first, Iterator last, T init)
+T
+parallel_accumulate(Iterator first, Iterator last, T init)
 {
-    unsigned long const length = std::distance(first,last); 
+  unsigned long const length = std::distance(first, last);
 
-    if (!length) return init;
+  if (!length)
+    return init;
 
-    unsigned long const min_per_thread = 25;
-    unsigned long const max_threads = 
-        (length+min_per_thread-1)/min_per_thread;
+  unsigned long const min_per_thread = 25;
+  unsigned long const max_threads =
+      (length + min_per_thread - 1) / min_per_thread;
 
-    unsigned long const hardware_threads = 
-        std::thread::hardware_concurrency();
+  unsigned long const hardware_threads = std::thread::hardware_concurrency();
 
-    unsigned long const num_threads = 
-        std::min(hardware_threads != 0 ? hardware_threads:2, max_threads);
+  unsigned long const num_threads =
+      std::min(hardware_threads != 0 ? hardware_threads : 2, max_threads);
 
-    unsigned long const block_size = length / num_threads;
+  unsigned long const block_size = length / num_threads;
 
-    std::vector<T> results(num_threads);
-    std::vector<std::thread> threads(num_threads-1);
+  std::vector<T> results(num_threads);
+  std::vector<std::thread> threads(num_threads - 1);
 
-    Iterator block_start = first;
-    for (unsigned long i = 0; i < (num_threads-1); ++i) 
-    {
-        Iterator block_end = block_start;
-        std::advance(block_end,block_size);
-        threads[i] = std::thread(
-                accumulate_block<Iterator,T>(),
-                block_start,block_end,std::ref(results[i]));
-        block_start = block_end;
-    }
-    accumulate_block<std::vector<int>::iterator,int>()(
-            block_start,last,results[num_threads-1]);
+  Iterator block_start = first;
+  for (unsigned long i = 0; i < (num_threads - 1); ++i) {
+    Iterator block_end = block_start;
+    std::advance(block_end, block_size);
+    threads[i]  = std::thread(accumulate_block<Iterator, T>(),
+                             block_start,
+                             block_end,
+                             std::ref(results[i]));
+    block_start = block_end;
+  }
+  accumulate_block<std::vector<int>::iterator, int>()(
+      block_start, last, results[num_threads - 1]);
 
-    std::for_each(threads.begin(),threads.end(),
-            std::mem_fn(&std::thread::join));
+  std::for_each(
+      threads.begin(), threads.end(), std::mem_fn(&std::thread::join));
 
-    return std::accumulate(results.begin(),results.end(),init);
+  return std::accumulate(results.begin(), results.end(), init);
 }
 
-int main()
+int
+main()
 {
-    std::vector<int> numbers(50);
-    for (int i = 0; i < 50; ++i) {
-        numbers[i] = i;
-    }
-    int result = parallel_accumulate<std::vector<int>::iterator,int>
-        (numbers.begin(),numbers.end(),0);
+  std::vector<int> numbers(50);
+  for (int i = 0; i < 50; ++i) {
+    numbers[i] = i;
+  }
+  int result = parallel_accumulate<std::vector<int>::iterator, int>(
+      numbers.begin(), numbers.end(), 0);
 
-    std::cout << "result: " << result << std::endl;
+  std::cout << "result: " << result << std::endl;
 }
-