@@ -60,14 +60,15 @@
     1.  [Headers](common.hpp)
     1.  [Containers](containers.md)
         1.  [vector](vector.cpp)
+        1.  [string](string.cpp)
         1.  [list](list.cpp)
         1.  [map](map.cpp)
         1.  [multimap](multimap.cpp)
         1.  [set](set.cpp)
             1.  [unordered_set](unordered_set.cpp)
         1.  [valarray](valarray.cpp)
         1.  [deque](deque.cpp)
-        1.  [string](string.cpp)
+        1.  [bitset](bitset.cpp)
     1.  IO
         1.  [sstream](sstream.cpp)
         1.  [iostream](iostream.cpp)
 
@@ -0,0 +1,19 @@
+#include "common.hpp"
+
+int main() {
+    // String init.
+    {
+        // Basic.
+        {
+            std::bitset<4> s("1010");
+            std::cout << s << std::endl;
+            assert(!s[0]);
+        }
+
+        // Missing bits: MSB filled with zeroes.
+        {
+            std::bitset<4> s("10");
+            assert(s == std::bitset<4>("0010"));
+        }
+    }
+}
@@ -15,6 +15,7 @@
 
 #include <atomic>
 #include <algorithm> // copy, erase, lower_bound, remove_if, swap, transform
+#include <bitset>
 #include <exception> // bad_alloc, bad_cast, bad_exception, bad_typeid, exception, ios_base::failure
 #include <fstream> // fstream, ifstream, ofstream
 #include <functional> // bind2nd
 
@@ -23,7 +23,7 @@ Read entire file into a string at once.
 */
 void read_file(std::ifstream &ifs, std::string &data_read) {
 	ifs.seekg(0, std::ios::end);
-	size_t size = ifs.tellg();
+	auto size = ifs.tellg();
 	data_read.resize(size);
 	ifs.seekg(0);
 	ifs.read(&data_read[0], size);