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get_if should return 0 when passed 0

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This commit is contained in:
Peter Dimov
2017-06-02 22:11:29 +03:00
parent c867329bb8
commit bdd449ae6a
3 changed files with 100 additions and 6 deletions
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include/boost/variant2/variant.hpp
+6 -6
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@@ -112,7 +112,7 @@ template<class U, class... T> constexpr bool holds_alternative( variant<T...> co
return v.index() == mp_find<variant<T...>, U>::value;
}
// get
// get (index)
template<std::size_t I, class... T> constexpr variant_alternative_t<I, variant<T...>>& get(variant<T...>& v)
{
@@ -178,7 +178,7 @@ template<std::size_t I, class... T> constexpr variant_alternative_t<I, variant<T
#endif
}
// get
// get (type)
template<class U, class... T> constexpr U& get(variant<T...>& v)
{
@@ -253,13 +253,13 @@ template<class U, class... T> constexpr U const&& get(variant<T...> const&& v)
template<std::size_t I, class... T> constexpr std::add_pointer_t<variant_alternative_t<I, variant<T...>>> get_if(variant<T...>* v) noexcept
{
static_assert( I < sizeof...(T), "Index out of bounds" );
return v->index() == I? &v->_get_impl( mp_size_t<I>() ): 0;
return v && v->index() == I? &v->_get_impl( mp_size_t<I>() ): 0;
}
template<std::size_t I, class... T> constexpr std::add_pointer_t<const variant_alternative_t<I, variant<T...>>> get_if(variant<T...> const * v) noexcept
{
static_assert( I < sizeof...(T), "Index out of bounds" );
return v->index() == I? &v->_get_impl( mp_size_t<I>() ): 0;
return v && v->index() == I? &v->_get_impl( mp_size_t<I>() ): 0;
}
template<class U, class... T> constexpr std::add_pointer_t<U> get_if(variant<T...>* v) noexcept
@@ -267,7 +267,7 @@ template<class U, class... T> constexpr std::add_pointer_t<U> get_if(variant<T..
static_assert( mp_count<variant<T...>, U>::value == 1, "The type must occur exactly once in the list of variant alternatives" );
constexpr auto I = mp_find<variant<T...>, U>::value;
return v->index() == I? &v->_get_impl( mp_size_t<I>() ): 0;
return v && v->index() == I? &v->_get_impl( mp_size_t<I>() ): 0;
}
template<class U, class... T> constexpr std::add_pointer_t<U const> get_if(variant<T...> const * v) noexcept
@@ -275,7 +275,7 @@ template<class U, class... T> constexpr std::add_pointer_t<U const> get_if(varia
static_assert( mp_count<variant<T...>, U>::value == 1, "The type must occur exactly once in the list of variant alternatives" );
constexpr auto I = mp_find<variant<T...>, U>::value;
return v->index() == I? &v->_get_impl( mp_size_t<I>() ): 0;
return v && v->index() == I? &v->_get_impl( mp_size_t<I>() ): 0;
}
//