bc8356bb83
std::identity was removed from the standards, but Visual Studio kept it as an extension. Replace it by std::remove_reference, which does just a little bit more than std::identity does, but without impact in this case.
44 lines
1.3 KiB
C++
44 lines
1.3 KiB
C++
/**
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******************************************************************************
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* Xenia : Xbox 360 Emulator Research Project *
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******************************************************************************
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* Copyright 2017 Ben Vanik. All rights reserved. *
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* Released under the BSD license - see LICENSE in the root for more details. *
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******************************************************************************
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*/
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#ifndef XENIA_BASE_BIT_FIELD_H_
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#define XENIA_BASE_BIT_FIELD_H_
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#include <cstdint>
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#include <cstdlib>
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#include <type_traits>
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namespace xe {
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// Bitfield, where position starts at the LSB.
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template <typename T, size_t position, size_t n_bits>
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struct bf {
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bf() = default;
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inline operator T() const { return value(); }
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inline T value() const {
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return static_cast<T>((storage & mask()) >> position);
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}
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// For enum values, we strip them down to an underlying type.
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typedef
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typename std::conditional<std::is_enum<T>::value, std::underlying_type<T>,
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std::remove_reference<T>>::type::type
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value_type;
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inline value_type mask() const {
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return (((value_type)~0) >> (8 * sizeof(value_type) - n_bits)) << position;
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}
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value_type storage;
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};
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} // namespace xe
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#endif // XENIA_BASE_BIT_FIELD_H_
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