The code generation macros are supposed to support parameter-dependent return types, but it turns out that they currently don't really do that. This commit fixes the issue.
These are breaking changes to PR #66.
* Remove are_tagged_arguments_mp11 and is_argument_pack_mp11. They were reviewed as redundant.
* Remove MP11 support for ArgumentPack models for now. (This feature relied on templates that were not supposed to be specialized.)
* Add are_tagged_arguments_mp11 and is_argument_pack_mp11 metafunctions when Boost.MP11 is usable.
* Predicate requirements can be encoded as Boost.MP11-style quoted metafunctions as well as by MPL binary metafunction classes.
* Argument packs qualify as Boost.MP11-style lists as well as MPL sequences.
* Internal components and test programs use Boost.MP11 and C++11 type traits vice MPL and Boost.TypeTraits when Boost.MP11 is usable.
* Add "test/literate/parameter-enabled-function-call-operators0.cpp" to test suite under alias 'parameter_literate_tests'.
* Add compose() test routine to "test/compose.cpp"
* Replace LIBS_PARAMETER_TEST_COMPILE_FAILURE_MSVC with LIBS_PARAMETER_TEST_COMPILE_FAILURE_VENDOR_SPECIFIC in case compilers other than MSVC start exhibiting errant behavior.
* Adjust for the fact that BOOST_PARAMETER_MAX_ARITY is defined regardless of whether or not BOOST_PARAMETER_HAS_PERFECT_FORWARDING is defined.
* Use minimal file headers to #include vice <boost/parameter.hpp>.
* Normalize license wording.
* Add statements to #include header files that directly define components used in this test.
* Qualify by namespace vice using declarations.
Decouple the compose() function and the BOOST_PARAMETER_NO_SPEC_* code generation macros from BOOST_PARAMETER_MAX_ARITY for older compilers so their generated functions can take in more arguments.
* Add variadic metafunction boost::parameter::are_tagged_arguments to help improve overload resolution capabilities. Used by compose() and the new BOOST_PARAMETER_NO_SPEC_* code generation macros.
* Add variadic function template compose() which takes in named arguments and returns them in an argument pack.
* Add code generation macros BOOST_PARAMETER_BASIC_FUNCTION_CALL_OPERATOR, BOOST_PARAMETER_BASIC_CONST_FUNCTION_CALL_OPERATOR, BOOST_PARAMETER_NO_SPEC_FUNCTION, BOOST_PARAMETER_NO_SPEC_MEMBER_FUNCTION, BOOST_PARAMETER_NO_SPEC_CONST_MEMBER_FUNCTION, BOOST_PARAMETER_NO_SPEC_FUNCTION_CALL_OPERATOR, BOOST_PARAMETER_NO_SPEC_CONST_FUNCTION_CALL_OPERATOR, BOOST_PARAMETER_NO_SPEC_CONSTRUCTOR, and BOOST_PARAMETER_NO_SPEC_NO_BASE_CONSTRUCTOR.
* Fix compiler error: base `boost::reference_wrapper<int>' with only non-default constructor in class without a constructor.
* Ignore normalized_argument_types test failures.
* Fix compiler failures showing up on regression test matrix due to void return type.
* Fix gcc-3.4 failures showing up regression test matrix due to binding string literals to non-const references to char const*.
* Update tutorial documentation to match literate tests.
<boost/parameter/aux_/arg_list.hpp>
* Use parameter::value_type vice mpl::find.
"test/compose.cpp"
* Test that mpl::has_key evaluates to mpl::false_ for keyword tags that are not in parameter::aux::arg_list.
"test/singular.cpp"
* Test that mpl::has_key evaluates to mpl::false_ for keyword tags that are not in parameter::aux::tagged_argument or parameter::aux::tagged_argument_rref.
Also move BOOST_PARAMETER_TEMPLATE_KEYWORD macro definition to <boost/parameter/template_keyword.hpp>, but #include this new header file in <boost/parameter/name.hpp> for backward compatibility.
<boost/parameter/aux_/template_keyword.hpp>
* Apply a modified version of David Abrahams' patch from <https://svn.boost.org/trac10/ticket/2793> which eliminates the need to wrap function types in boost::function or std::function instantiations.
"test/function_type_tpl_param.cpp"
* Demonstrate that keyword types generated by BOOST_PARAMETER_TEMPLATE_KEYWORD now store function types as-is without wrapping them in boost::function or std::function instantiations.
"doc/reference.rst"
"doc/html/reference.html"
* Add BOOST_PARAMETER_DISABLE_PERFECT_FORWARDING as a configuration macro.
* Mention by what libraries other macros which are not a part of Parameter itself are defined.
* Mention which non-Boost.Parameter macros can be altered to affect the Boost.Parameter configuration.
User library tests have been reporting numerous failures due to internal compiler errors that occur when perfect forwarding is unsupported. Setting BOOST_PARAMETER_EXPONENTIAL_OVERLOAD_THRESHOLD_ARITY to zero eliminates these failures. By doing this in Boost.Parameter, we relieve user code of the burden of doing this in their end. The trade-off is that our own tests need to define BOOST_PARAMETER_EXPONENTIAL_OVERLOAD_THRESHOLD_ARITY explicitly in order to take advantage of the benefits of not having to wrap boost::ref() or std::ref() around non-const lvalues. As this was always a C++03 workaround, the change should be worth the trade-off.
On an unrelated note, Travis Cl just deprecated "sudo: false". See <https://blog.travis-ci.com/2018-10-04-combining-linux-infrastructures>.
