From a6bdf21b314bb13bef2f87d24f573cd8c14f673d Mon Sep 17 00:00:00 2001
From: Kyle Lutz <kyle.r.lutz@gmail.com>
Date: Wed, 26 Nov 2014 08:42:48 -0800
Subject: [PATCH] Fix issue with copy() and std::vector<bool>

---
 .../compute/algorithm/detail/copy_to_host.hpp      | 13 +++++++++++++
 test/test_copy.cpp                                 | 14 ++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/include/boost/compute/algorithm/detail/copy_to_host.hpp b/include/boost/compute/algorithm/detail/copy_to_host.hpp
index f31cde2e..33700668 100644
--- a/include/boost/compute/algorithm/detail/copy_to_host.hpp
+++ b/include/boost/compute/algorithm/detail/copy_to_host.hpp
@@ -51,6 +51,19 @@ inline HostIterator copy_to_host(DeviceIterator first,
     return iterator_plus_distance(result, count);
 }
 
+// copy_to_host() specialization for std::vector<bool>
+template<class DeviceIterator>
+inline std::vector<bool>::iterator
+copy_to_host(DeviceIterator first,
+             DeviceIterator last,
+             std::vector<bool>::iterator result,
+             command_queue &queue)
+{
+    std::vector<uint8_t> temp(std::distance(first, last));
+    copy_to_host(first, last, temp.begin(), queue);
+    return std::copy(temp.begin(), temp.end(), result);
+}
+
 template<class DeviceIterator, class HostIterator>
 inline future<HostIterator> copy_to_host_async(DeviceIterator first,
                                                DeviceIterator last,
diff --git a/test/test_copy.cpp b/test/test_copy.cpp
index fdc949d4..4c621eef 100644
--- a/test/test_copy.cpp
+++ b/test/test_copy.cpp
@@ -292,4 +292,18 @@ BOOST_AUTO_TEST_CASE(copy_svm_ptr)
 }
 #endif // CL_VERSION_2_0
 
+BOOST_AUTO_TEST_CASE(copy_to_vector_bool)
+{
+    using compute::uchar_;
+
+    compute::vector<uchar_> vec;
+    vec.push_back(true, queue);
+    vec.push_back(false, queue);
+
+    std::vector<bool> host_vec(vec.size());
+    compute::copy(vec.begin(), vec.end(), host_vec.begin(), queue);
+    BOOST_CHECK(host_vec[0] == true);
+    BOOST_CHECK(host_vec[1] == false);
+}
+
 BOOST_AUTO_TEST_SUITE_END()