nerdcruft/libcruft-util
1
0
Fork 0
Code Issues Releases Activity

cast: prefer concepts to SFINAE

Browse Source
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
cast.hpp
View File

@ -34,12 +34,11 @@ namespace cruft::cast {
typename T, typename T,
typename U typename U
> >
std::enable_if_t< requires
sizeof(T) == sizeof(U) && (sizeof(T) == sizeof(U)) &&
std::is_unsigned<T>::value && std::is_unsigned<T>::value &&
std::is_signed<U>::value, std::is_signed<U>::value
T T
>
sign (const U u) sign (const U u)
{ {
CHECK_GE (u, 0); CHECK_GE (u, 0);
@ -52,12 +51,11 @@ namespace cruft::cast {
typename T, typename T,
typename U typename U
> >
std::enable_if_t< requires
sizeof(T) == sizeof (U) && (sizeof(T) == sizeof (U)) &&
std::is_signed<T>::value && std::is_signed<T>::value &&
std::is_unsigned<U>::value, std::is_unsigned<U>::value
T T
>
sign (const U u) sign (const U u)
{ {
CHECK_LT (u, std::numeric_limits<U>::max () / 2); 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 /// the converted value. Note: this is only a debug-time check and is
/// compiled out in optimised builds. /// compiled out in optimised builds.
template < template <
typename T, concepts::pointer T,
typename V typename V
> >
std::enable_if_t<std::is_pointer_v<T>,T> T
known (V *const v) known (V *const v)
{ {
CHECK (dynamic_cast<T> (v)); CHECK (dynamic_cast<T> (v));
@ -162,10 +160,10 @@ namespace cruft::cast {
//------------------------------------------------------------------------- //-------------------------------------------------------------------------
template < template <
typename T, concepts::reference T,
typename V typename V
> >
std::enable_if_t<std::is_reference_v<T>, T> T
known (V &v) known (V &v)
{ {
CHECK_NOTHROW (dynamic_cast<T> (v)); CHECK_NOTHROW (dynamic_cast<T> (v));
@ -179,9 +177,8 @@ namespace cruft::cast {
/// ///
/// Runtime checks will be compiled out if NDEBUG is defined. /// Runtime checks will be compiled out if NDEBUG is defined.
template < template <
typename DstT, concepts::pointer DstT,
typename SrcT, concepts::pointer SrcT
typename = std::enable_if_t<std::is_pointer_v<DstT> && std::is_pointer_v<SrcT>>
> >
DstT DstT
alignment (SrcT src) alignment (SrcT src)