StormByte::Type::Detail Namespace Reference

Private helpers. More...

Functions
template<typename U > requires TriviallyCopyable<U> && (sizeof(U) > 0)
constexpr U	swap_endian (U val) noexcept
	Reverses the object-representation byte order of val.
template<typename VariantT , typename U , std::size_t... I>
constexpr bool	variant_has_type_impl (std::index_sequence< I... > seq) noexcept
	Fold: is cv/ref-stripped U one of VariantT's alternatives?

Variables
template<typename T >
constexpr bool	is_variant_v = false
	true when T is exactly std::variant<Ts...> after cv/ref strip.
template<typename VariantT , typename U >
constexpr bool	variant_has_type_v
	Convenience wrapper around variant_has_type_impl.

Detailed Description

Private helpers.

Not a supported API.

Note

Other modules may call swap_endian. Do not depend on any other name in this namespace.

Function Documentation

swap_endian()

template<typename U >
requires TriviallyCopyable<U> && (sizeof(U) > 0)

constexpr U StormByte::Type::Detail::swap_endian ( U  val )

constexprnoexcept

Reverses the object-representation byte order of val.

Template Parameters

U	Trivially copyable value type.

Parameters

[in]

val

Value whose bytes are reversed.

Returns

val with endianness swapped.

Note

This always reverses bytes. Whether the caller should invoke it (host ≠ little-endian) is Serializable's job. Integrals go through std::byteswap; every other trivial type goes through std::bit_cast + reverse so float, enum and small POD structs stay defined.

Warning

Not a format detector. No BOM, no std::endian test.

variant_has_type_impl()

template<typename VariantT , typename U , std::size_t... I>

constexpr bool StormByte::Type::Detail::variant_has_type_impl ( std::index_sequence< I... >  seq )

constexprnoexcept

Fold: is cv/ref-stripped U one of VariantT's alternatives?

Template Parameters

VariantT	A std::variant<…> (already stripped by the caller).
U	Candidate alternative.
I	Index pack over std::variant_size_v<VariantT>.

Parameters

[in]

seq

Index sequence; unused except to expand I.

Returns

true if U matches any alternative.

Variable Documentation

is_variant_v

template<typename T >

constexpr bool StormByte::Type::Detail::is_variant_v< std::variant< Ts... > > = false

constexpr

true when T is exactly std::variant<Ts...> after cv/ref strip.

Specialization for every std::variant alternative list.

Template Parameters

T	Type to test.

Partial specialization of a variable template — not SFINAE. Needed because there is no standard std::is_variant.

Template Parameters

Ts	Variant alternatives.

variant_has_type_v

template<typename VariantT , typename U >

constexpr bool StormByte::Type::Detail::variant_has_type_v

constexpr

Initial value:

=
                variant_has_type_impl<VariantT, U>(
                    std::make_index_sequence<std::variant_size_v<VariantT>>()
                )

Convenience wrapper around variant_has_type_impl.

Template Parameters

VariantT	A std::variant<…>.
U	Candidate alternative.