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Merge pull request #30 from neobrain/bitfield_work

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BitField additions and fixes
This commit is contained in:
Tony Wasserka 2014-07-17 12:23:54 +02:00
parent 584f7aced5 0da8e2eacc
commit b6213784a4
1 changed files with 23 additions and 1 deletions
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24
src/common/bit_field.h
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@ -124,13 +124,34 @@ public:
// so that we can use this within unions
BitField() = default;
#ifndef _WIN32
// We explicitly delete the copy assigment operator here, because the
// default copy assignment would copy the full storage value, rather than
// just the bits relevant to this particular bit field.
// Ideally, we would just implement the copy assignment to copy only the
// relevant bits, but this requires compiler support for unrestricted
// unions.
// MSVC 2013 has no support for this, hence we disable this code on
// Windows (so that the default copy assignment operator will be used).
// For any C++11 conformant compiler we delete the operator to make sure
// we never use this inappropriate operator to begin with.
// TODO: Implement this operator properly once all target compilers
// support unrestricted unions.
BitField& operator=(const BitField&) = delete;
#endif
__forceinline BitField& operator=(T val)
{
storage = (storage & ~GetMask()) | ((val << position) & GetMask());
storage = (storage & ~GetMask()) | (((StorageType)val << position) & GetMask());
return *this;
}
__forceinline operator T() const
{
return Value();
}
__forceinline T Value() const
{
if (std::numeric_limits<T>::is_signed)
{
@ -168,5 +189,6 @@ private:
static_assert(position < 8 * sizeof(T), "Invalid position");
static_assert(bits <= 8 * sizeof(T), "Invalid number of bits");
static_assert(bits > 0, "Invalid number of bits");
static_assert(std::is_standard_layout<T>::value, "Invalid base type");
};
#pragma pack()