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Proper sfinae for vector & point constructors instead of static_assert

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This commit is contained in:
Nikita Lisitsa 2021-03-04 18:37:07 +03:00
parent 1bfbaaa840
commit 4914be8099
3 changed files with 19 additions and 8 deletions
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15
libs/geom/include/psemek/geom/detail/array.hpp
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@ -32,4 +32,19 @@ namespace psemek::geom::detail
}; };
}; };
template <typename T, typename ... Args>
struct all_convertible_to;
template <typename T>
struct all_convertible_to<T>
: std::true_type
{};
template <typename T, typename H, typename ... Args>
struct all_convertible_to<T, H, Args...>
: std::bool_constant<std::is_convertible_v<H, T>
&& all_convertible_to<T, Args...>::value>
{};
} }

6
libs/geom/include/psemek/geom/point.hpp
View file

@ -24,12 +24,10 @@ namespace psemek::geom
point & operator = (point &) = default; point & operator = (point &) = default;
point & operator = (point &&) = default; point & operator = (point &&) = default;
template <typename ... Args> template <typename ... Args, typename = std::enable_if_t<(sizeof...(Args) == N) && detail::all_convertible_to<T, Args...>::value>>
point(Args && ... args) point(Args && ... args)
: coords{ static_cast<T>(std::forward<Args>(args))... } : coords{ static_cast<T>(std::forward<Args>(args))... }
{ {}
static_assert(sizeof...(Args) == N);
}
std::size_t dimension() const std::size_t dimension() const
{ {

6
libs/geom/include/psemek/geom/vector.hpp
View file

@ -29,12 +29,10 @@ namespace psemek::geom
vector & operator = (vector &) = default; vector & operator = (vector &) = default;
vector & operator = (vector &&) = default; vector & operator = (vector &&) = default;
template <typename ... Args> template <typename ... Args, typename = std::enable_if_t<(sizeof...(Args) == N) && detail::all_convertible_to<T, Args...>::value>>
vector(Args && ... args) vector(Args && ... args)
: coords{ static_cast<T>(std::forward<Args>(args))... } : coords{ static_cast<T>(std::forward<Args>(args))... }
{ {}
static_assert(sizeof...(Args) == N);
}
std::size_t dimension() const std::size_t dimension() const
{ {