Branch for 2nd try at V2 removal

[SVN r77497]

.travis.yml

@@ -1,163 +0,0 @@
-# Copyright 2016 Edward Diener
-# Copyright 2016, 2017, 2021 Peter Dimov
-# Distributed under the Boost Software License, Version 1.0.
-# (See accompanying file LICENSE_1_0.txt or copy at http://boost.org/LICENSE_1_0.txt)
-
-language: cpp
-
-dist: xenial
-
-branches:
-  only:
-    - master
-    - develop
-    - /feature\/.*/
-
-env:
-  matrix:
-    - BOGUS_JOB=true
-
-matrix:
-
-  exclude:
-    - env: BOGUS_JOB=true
-
-  include:
-    - os: linux
-      compiler: g++-4.4
-      env: TOOLSET=gcc CXXSTD=98
-      addons:
-        apt:
-          packages:
-            - g++-4.4
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: g++-4.6
-      env: TOOLSET=gcc CXXSTD=03,0x
-      addons:
-        apt:
-          packages:
-            - g++-4.6
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: g++-4.8
-      env: TOOLSET=gcc CXXSTD=03,11
-      addons:
-        apt:
-          packages:
-            - g++-4.8
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: g++-5
-      env: TOOLSET=gcc CXXSTD=03,11,14
-      addons:
-        apt:
-          packages:
-            - g++-5
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: g++-7
-      env: TOOLSET=gcc CXXSTD=03,11,14,17
-      addons:
-        apt:
-          packages:
-            - g++-7
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: g++-9
-      env: TOOLSET=gcc CXXSTD=03,11,14,17
-      addons:
-        apt:
-          packages:
-            - g++-9
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      dist: bionic
-      compiler: g++-10
-      env: TOOLSET=gcc CXXSTD=03,11,14,17,2a
-      addons:
-        apt:
-          packages:
-            - g++-10
-          sources:
-            - sourceline: "ppa:ubuntu-toolchain-r/test"
-
-    - os: linux
-      dist: bionic
-      compiler: g++-11
-      env: UBSAN=1 TOOLSET=gcc CXXSTD=03,11,14,17,20 UBSAN_OPTIONS=print_stacktrace=1 LINKFLAGS=-fuse-ld=gold
-      addons:
-        apt:
-          packages:
-            - g++-11
-          sources:
-            - sourceline: "ppa:ubuntu-toolchain-r/test"
-
-    - os: linux
-      compiler: clang++-11
-      env: TOOLSET=clang CXXSTD=03,11,14,17,20
-      addons:
-        apt:
-          packages:
-            - clang-11
-          sources:
-            - ubuntu-toolchain-r-test
-            - sourceline: 'deb https://apt.llvm.org/xenial/ llvm-toolchain-xenial-11 main'
-              key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
-
-    - os: linux
-      compiler: clang++-12
-      env: UBSAN=1 TOOLSET=clang CXXSTD=03,11,14,17,20 UBSAN_OPTIONS=print_stacktrace=1
-      addons:
-        apt:
-          packages:
-            - clang-12
-          sources:
-            - ubuntu-toolchain-r-test
-            - sourceline: 'deb https://apt.llvm.org/xenial/ llvm-toolchain-xenial-12 main'
-              key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
-
-    - os: linux
-      dist: bionic
-      compiler: clang++-libc++
-      env: TOOLSET=clang CXXSTD=03,11,14,17,2a
-      addons:
-        apt:
-          packages:
-            - libc++-dev
-
-    - os: osx
-      compiler: clang++
-      env: UBSAN=1 TOOLSET=clang CXXSTD=03,11,14,1z UBSAN_OPTIONS=print_stacktrace=1
-
-install:
-  - BOOST_BRANCH=develop && [ "$TRAVIS_BRANCH" == "master" ] && BOOST_BRANCH=master || true
-  - cd ..
-  - git clone -b $BOOST_BRANCH https://github.com/boostorg/boost.git boost-root
-  - cd boost-root
-  - git submodule update --init tools/boostdep
-  - cp -r $TRAVIS_BUILD_DIR/* libs/lambda
-  - python tools/boostdep/depinst/depinst.py lambda
-  - ./bootstrap.sh
-  - ./b2 headers
-
-script:
-  - |-
-    echo "using $TOOLSET : : $TRAVIS_COMPILER ;" > ~/user-config.jam
-  - ./b2 -j3 libs/lambda/test toolset=$TOOLSET cxxstd=$CXXSTD variant=debug,release ${UBSAN:+cxxflags=-fsanitize=undefined cxxflags=-fno-sanitize-recover=undefined linkflags=-fsanitize=undefined define=UBSAN=1 debug-symbols=on} ${LINKFLAGS:+linkflags=$LINKFLAGS}
-
-notifications:
-  email:
-    on_success: always

CMakeLists.txt

@@ -1,34 +0,0 @@
-# Generated by `boostdep --cmake lambda`
-# Copyright 2020 Peter Dimov
-# Distributed under the Boost Software License, Version 1.0.
-# https://www.boost.org/LICENSE_1_0.txt
-
-cmake_minimum_required(VERSION 3.5...3.16)
-
-project(boost_lambda VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX)
-
-add_library(boost_lambda INTERFACE)
-add_library(Boost::lambda ALIAS boost_lambda)
-
-target_include_directories(boost_lambda INTERFACE include)
-
-target_link_libraries(boost_lambda
-  INTERFACE
-    Boost::bind
-    Boost::config
-    Boost::core
-    Boost::detail
-    Boost::iterator
-    Boost::mpl
-    Boost::preprocessor
-    Boost::tuple
-    Boost::type_traits
-    Boost::utility
-)
-
-if(BUILD_TESTING AND EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/test/CMakeLists.txt")
-
-  add_subdirectory(test)
-
-endif()
-

appveyor.yml

@@ -1,38 +0,0 @@
-# Copyright 2017 Edward Diener
-# Distributed under the Boost Software License, Version 1.0.
-# (See accompanying file LICENSE_1_0.txt or copy at http://boost.org/LICENSE_1_0.txt)
-
-version: 1.0.{build}-{branch}
-
-shallow_clone: true
-
-branches:
-  only:
-    - master
-    - develop
-
-environment:
-  matrix:
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-      TOOLSET: msvc-9.0,msvc-10.0,msvc-11.0,msvc-12.0,msvc-14.0
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      TOOLSET: msvc-14.1
-
-install:
-  - cd ..
-  - git clone -b %APPVEYOR_REPO_BRANCH% https://github.com/boostorg/boost.git boost-root
-  - cd boost-root
-  - git submodule update --init tools/build
-  - git submodule update --init libs/config
-  - git submodule update --init tools/boostdep
-  - git submodule update --init tools/boost_install
-  - git submodule update --init libs/headers
-  - xcopy /s /e /q %APPVEYOR_BUILD_FOLDER% libs\lambda
-  - python tools/boostdep/depinst/depinst.py lambda
-  - bootstrap
-  - b2 headers
-
-build: off
-
-test_script:
-  - b2 libs/lambda/test toolset=%TOOLSET%

doc/Jamfile.v2

@@ -1,4 +1,4 @@
-project lambda/doc ;
+project boost/doc ;
 import boostbook : boostbook ;
 
 # Are these really the correct images??
@@ -10,12 +10,3 @@ boostbook lambda-doc : lambda.xml
    <format>pdf:<xsl:param>img.src.path=$(images)/
 ;
 
-###############################################################################
-alias boostdoc
-    : lambda.xml
-    :
-    :
-    : ;
-explicit boostdoc ;
-alias boostrelease ;
-explicit boostrelease ;

doc/detail/lambda_doc.xml

@@ -3281,7 +3281,7 @@ was dropped.
 <abbrev>SGI02</abbrev>
 <title>The SGI Standard Template Library</title>
 <pubdate>2002</pubdate>
-<bibliomisc><ulink url="https://www.boost.org/sgi/stl/">www.boost.org/sgi/stl/</ulink></bibliomisc>
+<bibliomisc><ulink url="http://www.sgi.com/tech/stl/">www.sgi.com/tech/stl/</ulink></bibliomisc>
 
 </biblioentry>
     
@@ -3435,7 +3435,7 @@ was dropped.
 <firstname>Brian</firstname>
 <surname>McNamara</surname>
 </author>
-<bibliomisc><ulink url="http://yanniss.github.io/fc++/">yanniss.github.io/fc++/ </ulink>
+<bibliomisc><ulink url="http://www.cc.gatech.edu/~yannis/fc++/">www.cc.gatech.edu/~yannis/fc++/</ulink>
 </bibliomisc>
 <pubdate>2002</pubdate>
 </biblioentry>

doc/lambda.xml

@@ -3286,7 +3286,7 @@ was dropped.
 <abbrev>SGI02</abbrev>
 <title>The SGI Standard Template Library</title>
 <pubdate>2002</pubdate>
-<bibliomisc><ulink url="https://www.boost.org/sgi/stl/">www.boost.org/sgi/stl/</ulink></bibliomisc>
+<bibliomisc><ulink url="http://www.sgi.com/tech/stl/">www.sgi.com/tech/stl/</ulink></bibliomisc>
 
 </biblioentry>
     
@@ -3440,7 +3440,7 @@ was dropped.
 <firstname>Brian</firstname>
 <surname>McNamara</surname>
 </author>
-<bibliomisc><ulink url="http://yanniss.github.io/fc++/">yanniss.github.io/fc++/ </ulink>
+<bibliomisc><ulink url="http://www.cc.gatech.edu/~yannis/fc++/">www.cc.gatech.edu/~yannis/fc++/</ulink>
 </bibliomisc>
 <pubdate>2002</pubdate>
 </biblioentry>

include/boost/lambda/algorithm.hpp

@@ -684,8 +684,6 @@ struct rotate_copy {
 
 // random_shuffle  ---------------------------------
 
-#ifndef BOOST_NO_CXX98_RANDOM_SHUFFLE
-
 struct random_shuffle {
 
   template <class Args>
@@ -705,7 +703,6 @@ struct random_shuffle {
 
 };
 
-#endif
 
 // partition  ---------------------------------
 

include/boost/lambda/closures.hpp

@@ -11,8 +11,8 @@
     URL: http://spirit.sourceforge.net/
 
 ==============================================================================*/
-#ifndef BOOST_LAMBDA_CLOSURES_HPP
-#define BOOST_LAMBDA_CLOSURES_HPP
+#ifndef PHOENIX_CLOSURES_HPP
+#define PHOENIX_CLOSURES_HPP
 
 ///////////////////////////////////////////////////////////////////////////////
 #include "boost/lambda/core.hpp"

include/boost/lambda/core.hpp

@@ -22,8 +22,6 @@
 #ifndef BOOST_LAMBDA_CORE_HPP
 #define BOOST_LAMBDA_CORE_HPP
 
-#include "boost/config.hpp"
-
 #include "boost/type_traits/transform_traits.hpp"
 #include "boost/type_traits/cv_traits.hpp"
 
@@ -68,9 +66,9 @@ namespace {
   boost::lambda::placeholder2_type free2 = boost::lambda::placeholder2_type();
   boost::lambda::placeholder3_type free3 = boost::lambda::placeholder3_type();
 
-  boost::lambda::placeholder1_type& BOOST_ATTRIBUTE_UNUSED _1 = free1;
-  boost::lambda::placeholder2_type& BOOST_ATTRIBUTE_UNUSED _2 = free2;
-  boost::lambda::placeholder3_type& BOOST_ATTRIBUTE_UNUSED _3 = free3;
+  boost::lambda::placeholder1_type& _1 = free1;
+  boost::lambda::placeholder2_type& _2 = free2;
+  boost::lambda::placeholder3_type& _3 = free3;
   // _1, _2, ... naming scheme by Peter Dimov
 } // unnamed
    

include/boost/lambda/detail/lambda_config.hpp

@@ -22,6 +22,13 @@
 #     define BOOST_REF_TO_FUNC_CONFLICTS_WITH_REF_TO_T
 #     define BOOST_LAMBDA_INCORRECT_BIND_OVERLOADING
 #   endif
+#   if (__GNUC__ == 2 && __GNUC_MINOR__ <= 97) 
+#     define BOOST_NO_TEMPLATED_STREAMS
+#     define BOOST_LAMBDA_INCORRECT_BIND_OVERLOADING
+#   endif
+#   if (__GNUC__ == 2 && __GNUC_MINOR__ <= 95) 
+#     define BOOST_LAMBDA_FAILS_IN_TEMPLATE_KEYWORD_AFTER_SCOPE_OPER
+#   endif
 # endif  // __GNUC__
  
 

include/boost/lambda/detail/lambda_functors.hpp

@@ -15,7 +15,6 @@
 
 #include <boost/config.hpp>
 #include <boost/detail/workaround.hpp>
-#include <boost/utility/result_of.hpp>
 
 #if BOOST_WORKAROUND(BOOST_MSVC, == 1310)
 
@@ -298,38 +297,6 @@ public:
 } // namespace lambda
 } // namespace boost
 
-namespace boost {
-
-#if !defined(BOOST_RESULT_OF_USE_DECLTYPE) || defined(BOOST_NO_CXX11_DECLTYPE)
-
-template<class T>
-struct result_of<boost::lambda::lambda_functor<T>()>
-{
-    typedef typename boost::lambda::lambda_functor<T>::nullary_return_type type;
-};
-
-template<class T>
-struct result_of<const boost::lambda::lambda_functor<T>()>
-{
-    typedef typename boost::lambda::lambda_functor<T>::nullary_return_type type;
-};
-
-#endif
-
-template<class T>
-struct tr1_result_of<boost::lambda::lambda_functor<T>()>
-{
-    typedef typename boost::lambda::lambda_functor<T>::nullary_return_type type;
-};
-
-template<class T>
-struct tr1_result_of<const boost::lambda::lambda_functor<T>()>
-{
-    typedef typename boost::lambda::lambda_functor<T>::nullary_return_type type;
-};
-
-}
-
 // is_placeholder
 
 #include <boost/is_placeholder.hpp>

include/boost/lambda/detail/lambda_traits.hpp

@@ -282,11 +282,6 @@ struct const_copy_argument<void> {
   typedef void type;
 };
 
-template<>
-struct const_copy_argument<void const> {
-  typedef void type;
-};
-
 
 // Does the same as const_copy_argument, but passes references through as such
 template<class T>

include/boost/lambda/detail/operator_return_type_traits.hpp

@@ -12,13 +12,7 @@
 #define BOOST_LAMBDA_OPERATOR_RETURN_TYPE_TRAITS_HPP
 
 #include "boost/lambda/detail/is_instance_of.hpp"
-#include "boost/type_traits/is_same.hpp"
-#include "boost/type_traits/is_pointer.hpp"
-#include "boost/type_traits/is_float.hpp"
-#include "boost/type_traits/is_convertible.hpp"
-#include "boost/type_traits/remove_pointer.hpp"
-#include "boost/type_traits/remove_const.hpp"
-#include "boost/type_traits/remove_reference.hpp"
+#include "boost/type_traits/same_traits.hpp"
 
 #include "boost/indirect_reference.hpp"
 #include "boost/detail/container_fwd.hpp"
@@ -542,6 +536,36 @@ struct return_type_2<bitwise_action<Act>, A, B>
 
 namespace detail {
 
+#ifdef BOOST_NO_TEMPLATED_STREAMS
+
+template<class A, class B>
+struct leftshift_type {
+
+  typedef typename detail::IF<
+    boost::is_convertible<
+      typename boost::remove_reference<A>::type*,
+      std::ostream*
+    >::value,
+    std::ostream&, 
+    typename detail::remove_reference_and_cv<A>::type
+  >::RET type;
+};
+
+template<class A, class B>
+struct rightshift_type {
+
+  typedef typename detail::IF<
+
+    boost::is_convertible<
+      typename boost::remove_reference<A>::type*,
+      std::istream*
+    >::value, 
+    std::istream&,
+    typename detail::remove_reference_and_cv<A>::type
+  >::RET type;
+};
+
+#else
 
 template <class T> struct get_ostream_type {
   typedef std::basic_ostream<typename T::char_type, 
@@ -578,6 +602,7 @@ public:
 };
 
 
+#endif
 
 } // end detail
 

include/boost/lambda/detail/operators.hpp

@@ -161,6 +161,23 @@ namespace detail {
 
 // Note that the overloading is const vs. non-const first argument
 
+#ifdef BOOST_NO_TEMPLATED_STREAMS
+template<class T> struct convert_ostream_to_ref_others_to_c_plain_by_default {
+  typedef typename detail::IF<
+                       boost::is_convertible<T*, std::ostream*>::value,
+                       T&,
+                       typename const_copy_argument <T>::type
+                     >::RET type;
+};
+
+template<class T> struct convert_istream_to_ref_others_to_c_plain_by_default {
+  typedef typename detail::IF<
+                       boost::is_convertible<T*, std::istream*>::value,
+                       T&,
+                       typename const_copy_argument <T>::type
+                     >::RET type;
+};
+#else
 
 template<class T> struct convert_ostream_to_ref_others_to_c_plain_by_default {
   typedef typename detail::IF<
@@ -181,6 +198,7 @@ template<class T> struct convert_istream_to_ref_others_to_c_plain_by_default {
                        typename const_copy_argument <T>::type
                      >::RET type;
 };
+#endif
 
 } // detail
 

include/boost/lambda/detail/ret.hpp

@@ -284,7 +284,7 @@ inline const
 lambda_functor<
   lambda_functor_base<do_nothing_action, null_type> 
 > 
-make_void(const Arg1&) { 
+make_void(const Arg1& a1) { 
 return 
     lambda_functor_base<do_nothing_action, null_type>();
 }

include/boost/lambda/detail/return_type_traits.hpp

@@ -19,6 +19,10 @@
 namespace boost { 
 namespace lambda {
 
+using ::boost::type_traits::ice_and;
+using ::boost::type_traits::ice_or;
+using ::boost::type_traits::ice_not;
+
 // Much of the type deduction code for standard arithmetic types 
 // from Gary Powell
 
@@ -73,7 +77,8 @@ template <class Act, class A> struct return_type_1_prot {
 public:
   typedef typename 
     detail::IF<
-      is_protectable<Act>::value && is_lambda_functor<A>::value,
+  //      is_protectable<Act>::value && is_lambda_functor<A>::value,
+      ice_and<is_protectable<Act>::value, is_lambda_functor<A>::value>::value,
       lambda_functor<
         lambda_functor_base< 
           Act, 
@@ -107,7 +112,9 @@ namespace detail {
   // add const to rvalues, so that all rvalues are stored as const in 
   // the args tuple
     typedef typename detail::IF_type<
-      boost::is_reference<T>::value && !boost::is_const<non_ref_T>::value,
+//      boost::is_reference<T>::value && !boost::is_const<non_ref_T>::value,
+      ice_and<boost::is_reference<T>::value,
+              ice_not<boost::is_const<non_ref_T>::value>::value>::value,
       detail::identity_mapping<T>,
       const_copy_argument<non_ref_T> // handles funtion and array 
     >::type type;                      // types correctly
@@ -141,8 +148,11 @@ template <class Act, class A, class B> struct return_type_2_prot {
 
 typedef typename 
   detail::IF<
-    is_protectable<Act>::value &&
-      (is_lambda_functor<A>::value || is_lambda_functor<B>::value),
+//    is_protectable<Act>::value &&
+//      (is_lambda_functor<A>::value || is_lambda_functor<B>::value),
+    ice_and<is_protectable<Act>::value,
+            ice_or<is_lambda_functor<A>::value, 
+                   is_lambda_functor<B>::value>::value>::value,
     lambda_functor<
       lambda_functor_base< 
         Act, 
@@ -177,8 +187,11 @@ struct return_type_2_comma
 
 typedef typename 
   detail::IF<
-    is_protectable<other_action<comma_action> >::value && // it is protectable
-    (is_lambda_functor<A>::value || is_lambda_functor<B>::value),
+//  is_protectable<other_action<comma_action> >::value && // it is protectable
+//  (is_lambda_functor<A>::value || is_lambda_functor<B>::value),
+    ice_and<is_protectable<other_action<comma_action> >::value, // it is protectable
+            ice_or<is_lambda_functor<A>::value, 
+                   is_lambda_functor<B>::value>::value>::value,
     lambda_functor<
       lambda_functor_base< 
         other_action<comma_action>, 

include/boost/lambda/detail/suppress_unused.hpp

@@ -10,8 +10,8 @@
 
 // ------------------------------------------------------------
 
-#ifndef BOOST_LAMBDA_SUPPRESS_UNUSED_HPP
-#define BOOST_LAMBDA_SUPPRESS_UNUSED_HPP
+#ifndef BOOST_LAMBDA_SUPRESS_UNUSED_HPP
+#define BOOST_LAMBDA_SUPRESS_UNUSED_HPP
 
 namespace boost { 
 namespace lambda {

include/boost/lambda/if.hpp

@@ -345,7 +345,7 @@ public:
 //      is true, the true_statement (again an lambda_functor) is executed
 //      otherwise, the false_statement (another lambda_functor) is executed. The
 //      result type of this is void. Note the trailing underscore after
-//      if_ and the leading dot and the trailing underscore before
+//      if_ and the the leading dot and the trailing underscore before
 //      and after .else_.
 //
 ///////////////////////////////////////////////////////////////////////////////

include/boost/lambda/lambda.hpp

@@ -24,6 +24,11 @@
 
 
 #include "boost/lambda/detail/operators.hpp"
+
+#ifndef BOOST_LAMBDA_FAILS_IN_TEMPLATE_KEYWORD_AFTER_SCOPE_OPER
+// sorry, member ptr does not work with gcc2.95
 #include "boost/lambda/detail/member_ptr.hpp"
+#endif
+
 
 #endif

include/boost/lambda/loops.hpp

@@ -348,7 +348,7 @@ while_(CondT const& cond)
 //      While the condition (an lambda_functor) evaluates to true, statement
 //      (another lambda_functor) is executed. The statement is executed at least
 //      once. The result type of this is void. Note the trailing
-//      underscore after do_ and the leading dot and the trailing
+//      underscore after do_ and the the leading dot and the trailing
 //      underscore before and after .while_.
 //
 ///////////////////////////////////////////////////////////////////////////////

meta/libraries.json

@@ -1,15 +0,0 @@
-{
-    "key": "lambda",
-    "name": "Lambda",
-    "authors": [
-        "Jaakko Järvi",
-        "Gary Powell"
-    ],
-    "description": "Define small unnamed function objects at the actual call site, and more.",
-    "category": [
-        "Function-objects"
-    ],
-    "maintainers": [
-        "Jaakko Jarvi <jarvi -at- cs.tamu.edu>"
-    ]
-}

test/bind_tests_advanced.cpp

@@ -121,16 +121,8 @@ void test_unlambda() {
 
   BOOST_CHECK(call_with_101(_1 + 1) == 102);
 
-#if defined(BOOST_NO_CXX11_HDR_FUNCTIONAL)
-
   BOOST_CHECK(call_with_100(bl::bind(std_functor(std::bind1st(std::plus<int>(), 1)), _1)) == 101);
 
-#else
-
-  BOOST_CHECK(call_with_100(bl::bind(std_functor(std::bind(std::plus<int>(), 1, std::placeholders::_1)), _1)) == 101);
-
-#endif
-
   // std_functor insturcts LL that the functor defines a result_type typedef
   // rather than a sig template.
   bl::bind(std_functor(std::plus<int>()), _1, _2)(i, i);

test/result_of_tests.cpp

@@ -299,9 +299,8 @@ int test_main(int, char *[]) {
     BOOST_CHECK(boost::lambda::bind(with_result_template_reference(), var(one), var(two), var(three), var(four), var(five), var(six), var(seven), var(eight), var(nine))() == 9);
 
     // Check using result_of with lambda functors
-    BOOST_CHECK(apply0(constant(0)) == 0);
-    // returns local address and leads to undefined behavior
-    //~ BOOST_CHECK(apply1<int>(_1, one) == 1);
+    //BOOST_CHECK(apply0(constant(0)) == 0);
+    BOOST_CHECK(apply1<int>(_1, one) == 1);
     BOOST_CHECK(apply1<int&>(_1, one) == 1);
     BOOST_CHECK(apply1<const int&>(_1, one) == 1);
     BOOST_CHECK((apply2<int, int>(_1 + _2, one, two) == 3));