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Added comments #2980

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This commit is contained in:
Alexey Milovidov 2018-08-30 23:12:15 +03:00
parent e0b1b5ff78
commit 06053d9c1f
1 changed files with 5 additions and 2 deletions
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7
dbms/src/IO/BufferWithOwnMemory.h
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@ -26,8 +26,10 @@ namespace DB
*/
struct Memory : boost::noncopyable, Allocator<false>
{
/// Padding is needed to allow usage of 'memcpySmallAllowReadWriteOverflow15' function with this buffer.
static constexpr size_t pad_right = 15;
size_t m_capacity = 0;
size_t m_capacity = 0; /// With padding.
size_t m_size = 0;
char * m_data = nullptr;
size_t alignment = 0;
@ -70,7 +72,8 @@ struct Memory : boost::noncopyable, Allocator<false>
{
if (0 == m_capacity)
{
m_size = m_capacity = new_size;
m_size = new_size;
m_capacity = new_size;
alloc();
}
else if (new_size <= m_size)