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Subject: [Boost-commit] svn:boost r60405 - in branches/release: . boost boost/accumulators/numeric/functional boost/algorithm/string boost/bimap boost/config boost/filesystem boost/fusion boost/graph boost/integer boost/interprocess boost/intrusive boost/iostreams boost/math boost/numeric/ublas boost/program_options boost/property_tree boost/python boost/regex boost/signals boost/signals2 boost/spirit boost/spirit/home boost/spirit/home/karma boost/spirit/home/support boost/statechart boost/system boost/thread boost/tr1 boost/type_traits boost/uuid boost/variant boost/wave libs libs/array/doc libs/bimap libs/config libs/filesystem libs/fusion libs/graph_parallel libs/integer libs/interprocess libs/intrusive libs/iostreams libs/math libs/mpl/doc/refmanual libs/mpl/doc/src/refmanual libs/numeric/ublas libs/numeric/ublas/doc libs/program_options libs/property_tree libs/python libs/regex libs/regex/doc libs/serialization libs/signals libs/signals2 libs/spirit libs/spirit/classic/example libs/spirit/doc libs/spirit/example libs/spirit/phoenix libs/spirit/test libs/spirit/test/qi libs/statechart libs/static_assert libs/system libs/thread libs/thread/doc libs/timer libs/tr1 libs/type_traits libs/uuid libs/wave more people status tools tools/bcp tools/inspect tools/regression tools/release tools/wave wiki
From: eric_at_[hidden]
Date: 2010-03-09 21:31:35

Author: eric_niebler
Date: 2010-03-09 21:31:34 EST (Tue, 09 Mar 2010)
New Revision: 60405
URL: http://svn.boost.org/trac/boost/changeset/60405

Log:
Merged revisions 59374 via svnmerge from
https://svn.boost.org/svn/boost/trunk

........
  r59374 | eric_niebler | 2010-01-31 11:27:21 +1100 (Sun, 31 Jan 2010) | 1 line

  avoid premature template evaluation in operator overload return types
........

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Text files modified:
   branches/release/boost/accumulators/numeric/functional/valarray.hpp | 21 +++++++++++++++------
   branches/release/boost/accumulators/numeric/functional/vector.hpp | 21 +++++++++++++++------
   2 files changed, 30 insertions(+), 12 deletions(-)

Modified: branches/release/boost/accumulators/numeric/functional/valarray.hpp
==============================================================================
--- branches/release/boost/accumulators/numeric/functional/valarray.hpp (original)
+++ branches/release/boost/accumulators/numeric/functional/valarray.hpp 2010-03-09 21:31:34 EST (Tue, 09 Mar 2010)
@@ -29,12 +29,21 @@
{
     namespace operators
     {
+ namespace detail
+ {
+ template<typename Fun>
+ struct make_valarray
+ {
+ typedef std::valarray<typename Fun::result_type> type;
+ };
+ }
+
         ///////////////////////////////////////////////////////////////////////////////
         // Handle valarray<Left> / Right where Right is a scalar and Right != Left.
         template<typename Left, typename Right>
- typename enable_if<
+ typename lazy_enable_if<
             mpl::and_<is_scalar<Right>, mpl::not_<is_same<Left, Right> > >
- , std::valarray<typename functional::divides<Left, Right>::result_type>
+ , detail::make_valarray<functional::divides<Left, Right> >
>::type
         operator /(std::valarray<Left> const &left, Right const &right)
         {
@@ -50,9 +59,9 @@
         ///////////////////////////////////////////////////////////////////////////////
         // Handle valarray<Left> * Right where Right is a scalar and Right != Left.
         template<typename Left, typename Right>
- typename enable_if<
+ typename lazy_enable_if<
             mpl::and_<is_scalar<Right>, mpl::not_<is_same<Left, Right> > >
- , std::valarray<typename functional::multiplies<Left, Right>::result_type>
+ , detail::make_valarray<functional::multiplies<Left, Right> >
>::type
         operator *(std::valarray<Left> const &left, Right const &right)
         {
@@ -68,9 +77,9 @@
         ///////////////////////////////////////////////////////////////////////////////
         // Handle valarray<Left> + valarray<Right> where Right != Left.
         template<typename Left, typename Right>
- typename disable_if<
+ typename lazy_disable_if<
             is_same<Left, Right>
- , std::valarray<typename functional::plus<Left, Right>::result_type>
+ , detail::make_valarray<functional::plus<Left, Right> >
>::type
         operator +(std::valarray<Left> const &left, std::valarray<Right> const &right)
         {

Modified: branches/release/boost/accumulators/numeric/functional/vector.hpp
==============================================================================
--- branches/release/boost/accumulators/numeric/functional/vector.hpp (original)
+++ branches/release/boost/accumulators/numeric/functional/vector.hpp 2010-03-09 21:31:34 EST (Tue, 09 Mar 2010)
@@ -28,12 +28,21 @@
{
     namespace operators
     {
+ namespace detail
+ {
+ template<typename Fun>
+ struct make_vector
+ {
+ typedef std::vector<typename Fun::result_type> type;
+ };
+ }
+
         ///////////////////////////////////////////////////////////////////////////////
         // Handle vector<Left> / Right where Right is a scalar.
         template<typename Left, typename Right>
- typename enable_if<
+ typename lazy_enable_if<
             is_scalar<Right>
- , std::vector<typename functional::divides<Left, Right>::result_type>
+ , detail::make_vector<functional::divides<Left, Right> >
>::type
         operator /(std::vector<Left> const &left, Right const &right)
         {
@@ -64,9 +73,9 @@
         ///////////////////////////////////////////////////////////////////////////////
         // Handle vector<Left> * Right where Right is a scalar.
         template<typename Left, typename Right>
- typename enable_if<
+ typename lazy_enable_if<
             is_scalar<Right>
- , std::vector<typename functional::multiplies<Left, Right>::result_type>
+ , detail::make_vector<functional::multiplies<Left, Right> >
>::type
         operator *(std::vector<Left> const &left, Right const &right)
         {
@@ -82,9 +91,9 @@
         ///////////////////////////////////////////////////////////////////////////////
         // Handle Left * vector<Right> where Left is a scalar.
         template<typename Left, typename Right>
- typename enable_if<
+ typename lazy_enable_if<
             is_scalar<Left>
- , std::vector<typename functional::multiplies<Left, Right>::result_type>
+ , detail::make_vector<functional::multiplies<Left, Right> >
>::type
         operator *(Left const &left, std::vector<Right> const &right)
         {

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