Add all() (#8445).

Includes test cases.

bitset_test.hpp

@@ -712,6 +712,18 @@ struct bitset_test {
     BOOST_CHECK(Bitset(b).set().count() == b.size());
   }
 
+  static void all(const Bitset& b)
+  {
+    BOOST_CHECK(b.all() == (b.count() == b.size()));
+    bool result = true;
+    for(std::size_t i = 0; i < b.size(); ++i)
+      if(!b[i]) {
+        result = false;
+        break;
+      }
+    BOOST_CHECK(b.all() == result);
+  }
+
   static void any(const Bitset& b)
   {
     BOOST_CHECK(b.any() == (b.count() != 0));

dyn_bitset_unit_tests3.cpp

@@ -1,6 +1,7 @@
 // -----------------------------------------------------------
 //              Copyright (c) 2001 Jeremy Siek
 //           Copyright (c) 2003-2006 Gennaro Prota
+//             Copyright (c) 2014 Ahmed Charles
 //
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
@@ -121,6 +122,29 @@ void run_test_cases( BOOST_EXPLICIT_TEMPLATE_TYPE(Block) )
     Tests::size(b);
   }
   //=====================================================================
+  // Test b.all()
+  {
+    boost::dynamic_bitset<Block> b;
+    Tests::all(b);
+    Tests::all(~b);
+    Tests::all(b.set());
+    Tests::all(b.reset());
+  }
+  {
+    boost::dynamic_bitset<Block> b(std::string("0"));
+    Tests::all(b);
+    Tests::all(~b);
+    Tests::all(b.set());
+    Tests::all(b.reset());
+  }
+  {
+    boost::dynamic_bitset<Block> b(long_string);
+    Tests::all(b);
+    Tests::all(~b);
+    Tests::all(b.set());
+    Tests::all(b.reset());
+  }
+  //=====================================================================
   // Test b.any()
   {
     boost::dynamic_bitset<Block> b;

dynamic_bitset.html

@@ -202,6 +202,7 @@ public:
     dynamic_bitset&amp; <a href="#flip2">flip</a>(size_type n);
     dynamic_bitset&amp; <a href="#flip1">flip</a>();
     bool <a href="#test">test</a>(size_type n) const;
+    bool <a href="#all">all</a>() const;
     bool <a href="#any">any</a>() const;
     bool <a href="#none">none</a>() const;
     dynamic_bitset <a href="#op-not">operator~</a>() const;
@@ -1122,6 +1123,15 @@ size_type <a id="count">count</a>() const
 set.<br />
 <b>Throws:</b> nothing.
 
+<hr />
+<pre>
+bool <a id="all">all</a>() const
+</pre>
+
+<b>Returns:</b> <tt>true</tt> if all bits in this bitset are set or
+if <tt>size() == 0</tt>, and otherwise returns <tt>false</tt>.<br />
+<b>Throws:</b> nothing.
+
 <hr />
 <pre>
 bool <a id="any">any</a>() const

include/boost/dynamic_bitset/dynamic_bitset.hpp

@@ -278,6 +278,7 @@ public:
     dynamic_bitset& flip(size_type n);
     dynamic_bitset& flip();
     bool test(size_type n) const;
+    bool all() const;
     bool any() const;
     bool none() const;
     dynamic_bitset operator~() const;
@@ -1001,6 +1002,36 @@ bool dynamic_bitset<Block, Allocator>::test(size_type pos) const
     return m_unchecked_test(pos);
 }
 
+template <typename Block, typename Allocator>
+bool dynamic_bitset<Block, Allocator>::all() const
+{
+    if (empty()) {
+        return true;
+    }
+
+    const block_width_type extra_bits = count_extra_bits();
+    block_type const all_ones = ~static_cast<Block>(0);
+
+    if (extra_bits == 0) {
+        for (size_type i = 0, e = num_blocks(); i < e; ++i) {
+            if (m_bits[i] != all_ones) {
+                return false;
+            }
+        }
+    } else {
+        for (size_type i = 0, e = num_blocks() - 1; i < e; ++i) {
+            if (m_bits[i] != all_ones) {
+                return false;
+            }
+        }
+        block_type const mask = ~(~static_cast<Block>(0) << extra_bits);
+        if (m_highest_block() != mask) {
+            return false;
+        }
+    }
+    return true;
+}
+
 template <typename Block, typename Allocator>
 bool dynamic_bitset<Block, Allocator>::any() const
 {