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cast: prefer concepts to SFINAE

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This commit is contained in:
Danny Robson 2020-03-16 14:12:33 +11:00
parent c528e28a0e
commit 29e876c712
1 changed files with 14 additions and 17 deletions
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31
cast.hpp
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@ -34,12 +34,11 @@ namespace cruft::cast {
typename T,
typename U
>
std::enable_if_t<
sizeof(T) == sizeof(U) &&
requires
(sizeof(T) == sizeof(U)) &&
std::is_unsigned<T>::value &&
std::is_signed<U>::value,
T
>
std::is_signed<U>::value
T
sign (const U u)
{
CHECK_GE (u, 0);
@ -52,12 +51,11 @@ namespace cruft::cast {
typename T,
typename U
>
std::enable_if_t<
sizeof(T) == sizeof (U) &&
requires
(sizeof(T) == sizeof (U)) &&
std::is_signed<T>::value &&
std::is_unsigned<U>::value,
T
>
std::is_unsigned<U>::value
T
sign (const U u)
{
CHECK_LT (u, std::numeric_limits<U>::max () / 2);
@ -149,10 +147,10 @@ namespace cruft::cast {
/// the converted value. Note: this is only a debug-time check and is
/// compiled out in optimised builds.
template <
typename T,
concepts::pointer T,
typename V
>
std::enable_if_t<std::is_pointer_v<T>,T>
T
known (V *const v)
{
CHECK (dynamic_cast<T> (v));
@ -162,10 +160,10 @@ namespace cruft::cast {
//-------------------------------------------------------------------------
template <
typename T,
concepts::reference T,
typename V
>
std::enable_if_t<std::is_reference_v<T>, T>
T
known (V &v)
{
CHECK_NOTHROW (dynamic_cast<T> (v));
@ -179,9 +177,8 @@ namespace cruft::cast {
///
/// Runtime checks will be compiled out if NDEBUG is defined.
template <
typename DstT,
typename SrcT,
typename = std::enable_if_t<std::is_pointer_v<DstT> && std::is_pointer_v<SrcT>>
concepts::pointer DstT,
concepts::pointer SrcT
>
DstT
alignment (SrcT src)