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b9a3f2e7e2
Ensure cm::dynamic_reference_cast has same behavior as dynamic_cast on reference: raise std::bad_cast if dynamic_cast is not possible.
41 lines
867 B
C++
41 lines
867 B
C++
// -*-c++-*-
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// vim: set ft=cpp:
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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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file Copyright.txt or https://cmake.org/licensing for details. */
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#ifndef cmext_memory
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#define cmext_memory
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#include <typeinfo>
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#include <cm/type_traits>
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namespace cm {
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template <typename T, typename O,
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cm::enable_if_t<
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std::is_pointer<cm::invoke_result_t<decltype(&O::get), O>>::value,
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int> = 0>
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T& static_reference_cast(O& item)
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{
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return *(static_cast<T*>(item.get()));
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}
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template <typename T, typename O,
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cm::enable_if_t<
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std::is_pointer<cm::invoke_result_t<decltype(&O::get), O>>::value,
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int> = 0>
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T& dynamic_reference_cast(O& item)
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{
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auto p = dynamic_cast<T*>(item.get());
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if (p == nullptr) {
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throw std::bad_cast();
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}
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return *p;
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}
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} // namespace cm
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#endif
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