stabilize build system: depends, installer, boost/bdb fixes, cross targets groundwork

depends/x86_64-pc-linux-gnu/include/boost/compute/functional/field.hpp

@@ -0,0 +1,86 @@
+//---------------------------------------------------------------------------//
+// Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
+//
+// Distributed under the Boost Software License, Version 1.0
+// See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt
+//
+// See http://boostorg.github.com/compute for more information.
+//---------------------------------------------------------------------------//
+
+#ifndef BOOST_COMPUTE_FUNCTIONAL_FIELD_HPP
+#define BOOST_COMPUTE_FUNCTIONAL_FIELD_HPP
+
+#include <string>
+
+namespace boost {
+namespace compute {
+namespace detail {
+
+template<class T, class Arg>
+struct invoked_field
+{
+    typedef T result_type;
+
+    invoked_field(const Arg &arg, const std::string &field)
+        : m_arg(arg),
+          m_field(field)
+    {
+    }
+
+    Arg m_arg;
+    std::string m_field;
+};
+
+} // end detail namespace
+
+/// Returns the named field from a value.
+///
+/// The template-type \c T specifies the field's value type. Note
+/// that the value type must match the actual type of the field
+/// otherwise runtime compilation or logic errors may occur.
+///
+/// For example, to access the \c second field in a
+/// \c std::pair<int, float> object:
+/// \code
+/// field<float>("second");
+/// \endcode
+///
+/// This can also be used with vector types to access individual
+/// components as well as perform swizzle operations.
+///
+/// For example, to access the first and third components of an
+/// \c int vector type (e.g. \c int4):
+/// \code
+/// field<int2_>("xz");
+/// \endcode
+///
+/// \see \ref get "get<N>"
+template<class T>
+class field
+{
+public:
+    /// Result type.
+    typedef T result_type;
+
+    /// Creates a new field functor with \p field.
+    field(const std::string &field)
+        : m_field(field)
+    {
+    }
+
+    /// \internal_
+    template<class Arg>
+    detail::invoked_field<T, Arg> operator()(const Arg &arg) const
+    {
+        return detail::invoked_field<T, Arg>(arg, m_field);
+    }
+
+private:
+    std::string m_field;
+};
+
+} // end compute namespace
+} // end boost namespace
+
+#endif // BOOST_COMPUTE_FUNCTIONAL_FIELD_HPP