46 lines
1.3 KiB
C++
46 lines
1.3 KiB
C++
#pragma once
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template <typename T> constexpr T is_aligned(T value, T alignment)
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{
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return (value % alignment == 0);
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}
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static_assert(is_aligned(1024, 512));
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static_assert(!is_aligned(235, 32));
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static_assert(is_aligned(40960, 4096));
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template <typename T> constexpr T align_down(T value, T alignment)
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{
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return value - (value % alignment);
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}
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static_assert(align_down(598, 512) == 512);
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static_assert(align_down(194, 64) == 192);
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static_assert(align_down(62, 31) == 62);
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template <typename T> constexpr T align_up(T value, T alignment)
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{
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if (is_aligned(value, alignment)) return value;
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return align_down(value, alignment) + alignment;
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}
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static_assert(align_up(598, 512) == 1024);
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static_assert(align_up(194, 64) == 256);
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static_assert(align_up(62, 31) == 62);
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template <typename T> constexpr T get_blocks_from_size(T value, T block_size)
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{
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return (value + (block_size - 1)) / block_size;
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}
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static_assert(get_blocks_from_size(40960, 4096) == 10);
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static_assert(get_blocks_from_size(194, 64) == 4);
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static_assert(get_blocks_from_size(2, 32) == 1);
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static_assert(get_blocks_from_size(0, 256) == 0);
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// Offset a pointer by exactly <offset> bytes, no matter the type. Useful to avoid the quirks that come from C pointer
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// arithmetic.
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template <typename T, typename Offset> constexpr T* offset_ptr(T* ptr, Offset offset)
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{
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return (T*)((char*)ptr + offset);
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} |