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util/Cast: add const overloads

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This commit is contained in:
Max Kellermann 2014-07-14 16:02:02 +02:00
parent 393cb7fd7d
commit f8da8b0261
1 changed files with 16 additions and 0 deletions
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16
src/util/Cast.hxx
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@ -41,6 +41,15 @@ OffsetPointer(void *p, ptrdiff_t offset)
return (char *)p + offset; return (char *)p + offset;
} }
/**
* Offset the given pointer by the specified number of bytes.
*/
static inline constexpr const void *
OffsetPointer(const void *p, ptrdiff_t offset)
{
return (const char *)p + offset;
}
template<typename T, typename U> template<typename T, typename U>
static inline constexpr T * static inline constexpr T *
OffsetCast(U *p, ptrdiff_t offset) OffsetCast(U *p, ptrdiff_t offset)
@ -48,6 +57,13 @@ OffsetCast(U *p, ptrdiff_t offset)
return reinterpret_cast<T *>(OffsetPointer(p, offset)); return reinterpret_cast<T *>(OffsetPointer(p, offset));
} }
template<typename T, typename U>
static inline constexpr T *
OffsetCast(const U *p, ptrdiff_t offset)
{
return reinterpret_cast<const T *>(OffsetPointer(p, offset));
}
/** /**
* Cast the given pointer to a struct member to its parent structure. * Cast the given pointer to a struct member to its parent structure.
*/ */