Update NVP implementation, tests, docs

doc/nvp.qbk

@@ -48,14 +48,8 @@ public:
     T& value() const noexcept;
 
     const T& const_value() const noexcept;
-
-    template<class A>
-    void serialize(A& archive, unsigned);
 };
 
-template<class T>
-struct is_nvp;
-
 template<class T>
 const nvp<T> make_nvp(const char* name, T& value) noexcept;
 
@@ -79,19 +73,7 @@ const nvp<T> make_nvp(const char* name, T& value) noexcept;
 [[`T& value() const noexcept;`]
 [Returns a reference to the value.]]
 [[`const T& const_value() const noexcept;`]
-[Returns a reference to the value.]]
-[[`template<class A> void serialize(A& archive, unsigned);`]
-[Calls `archive.operator<<(const_value())` if `A::is_saving` is a true type,
-otherwise `archive.operator>>(value())`.]]]
-
-[endsect]
-
-[section Traits]
-
-[variablelist
-[[`template<class T> struct is_nvp;`]
-[Provides static constant `value` equal to true if `T` is an NVP type,
-otherwise false.]]]
+[Returns a reference to the value.]]]
 
 [endsect]
 

include/boost/core/nvp.hpp

@@ -12,28 +12,6 @@ Distributed under the Boost Software License, Version 1.0.
 #include <boost/config.hpp>
 
 namespace boost {
-namespace detail {
-
-template<bool V>
-struct nvp_bool {
-    typedef bool value_type;
-    typedef nvp_bool type;
-
-    BOOST_STATIC_CONSTEXPR bool value = V;
-
-    BOOST_CONSTEXPR operator bool() const BOOST_NOEXCEPT {
-        return V;
-    }
-
-    BOOST_CONSTEXPR bool operator()() const BOOST_NOEXCEPT {
-        return V;
-    }
-};
-
-template<bool V>
-BOOST_CONSTEXPR_OR_CONST bool nvp_bool<V>::value;
-
-} /* detail */
 
 template<class T>
 class nvp {
@@ -54,46 +32,11 @@ public:
         return *v_;
     }
 
-    template<class A>
-    void serialize(A& a, unsigned) {
-        archive(a, detail::nvp_bool<A::is_saving::value>());
-    }
-
 private:
-    template<class A>
-    void archive(A& a, detail::nvp_bool<true>) const {
-        a.operator<<(*v_);
-    }
-
-    template<class A>
-    void archive(A& a, detail::nvp_bool<false>) {
-        a.operator>>(*v_);
-    }
-
     const char* n_;
     T* v_;
 };
 
-template<class>
-struct is_nvp
-    : detail::nvp_bool<false> { };
-
-template<class T>
-struct is_nvp<nvp<T> >
-    : detail::nvp_bool<true> { };
-
-template<class T>
-struct is_nvp<const nvp<T> >
-    : detail::nvp_bool<true> { };
-
-template<class T>
-struct is_nvp<volatile nvp<T> >
-    : detail::nvp_bool<true> { };
-
-template<class T>
-struct is_nvp<const volatile nvp<T> >
-    : detail::nvp_bool<true> { };
-
 template<class T>
 inline const nvp<T>
 make_nvp(const char* n, T& v) BOOST_NOEXCEPT

test/nvp_test.cpp

@@ -8,44 +8,6 @@ Distributed under the Boost Software License, Version 1.0.
 #include <boost/core/nvp.hpp>
 #include <boost/core/lightweight_test_trait.hpp>
 
-class saver {
-public:
-    struct is_saving {
-        static const bool value = true;
-    };
-
-    explicit saver(int value)
-        : value_(value) { }
-
-    int get() const {
-        return value_;
-    }
-
-    void operator<<(int value) {
-        value_ = value;
-    }
-
-private:
-    int value_;
-};
-
-class loader {
-public:
-    struct is_saving {
-        static const bool value = false;
-    };
-
-    explicit loader(int value)
-        : value_(value) { }
-
-    void operator>>(int& value) {
-        value = value_;
-    }
-
-private:
-    int value_;
-};
-
 void test()
 {
     const char* n = "name";
@@ -56,33 +18,6 @@ void test()
     BOOST_TEST_EQ(&p.value(), &v);
 }
 
-void test_serialize()
-{
-    int v = 1;
-    boost::nvp<int> p("name", v);
-    saver s(0);
-    p.serialize(s, unsigned());
-    BOOST_TEST_EQ(s.get(), 1);
-}
-
-void test_deserialize()
-{
-    int v = 1;
-    boost::nvp<int> p("name", v);
-    loader l(5);
-    p.serialize(l, unsigned());
-    BOOST_TEST_EQ(p.value(), 5);
-}
-
-void test_trait()
-{
-    BOOST_TEST_TRAIT_FALSE((boost::is_nvp<int>));
-    BOOST_TEST_TRAIT_TRUE((boost::is_nvp<boost::nvp<int> >));
-    BOOST_TEST_TRAIT_TRUE((boost::is_nvp<const boost::nvp<int> >));
-    BOOST_TEST_TRAIT_TRUE((boost::is_nvp<volatile boost::nvp<int> >));
-    BOOST_TEST_TRAIT_TRUE((boost::is_nvp<const volatile boost::nvp<int> >));
-}
-
 void test_factory()
 {
     const char* n = "name";
@@ -96,9 +31,6 @@ void test_factory()
 int main()
 {
     test();
-    test_serialize();
-    test_deserialize();
-    test_trait();
     test_factory();
     return boost::report_errors();
 }