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fix: apply simpler expression with fewer workarounds

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Henry Schreiner 2021-08-06 13:03:26 -04:00
parent 5f4d725918
commit 1fafd1b447
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1 changed files with 4 additions and 5 deletions
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9
include/pybind11/detail/type_caster_base.h
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@ -927,18 +927,17 @@ protected:
using Constructor = void *(*)(const void *);
/* Only enabled when the types are {copy,move}-constructible *and* when the type
does not have a private operator new implementation. */
does not have a private operator new implementation. A comma operator is used in the decltype
argument to apply SFINAE to the public copy/move constructors.*/
template <typename T, typename = enable_if_t<is_copy_constructible<T>::value>>
static auto make_copy_constructor(const T *x) -> decltype(new T(*x), Constructor{}) {
PYBIND11_WORKAROUND_INCORRECT_MSVC_C4100(x);
static auto make_copy_constructor(const T *) -> decltype(new T(std::declval<const T>()), Constructor{}) {
return [](const void *arg) -> void * {
return new T(*reinterpret_cast<const T *>(arg));
};
}
template <typename T, typename = enable_if_t<std::is_move_constructible<T>::value>>
static auto make_move_constructor(const T *x) -> decltype(new T(std::move(*const_cast<T *>(x))), Constructor{}) {
PYBIND11_WORKAROUND_INCORRECT_MSVC_C4100(x);
static auto make_move_constructor(const T *) -> decltype(new T(std::declval<T&&>()), Constructor{}) {
return [](const void *arg) -> void * {
return new T(std::move(*const_cast<T *>(reinterpret_cast<const T *>(arg))));
};