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Use inheritance, it is better

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This commit is contained in:
Danila Kutenin 2019-04-06 20:25:54 +03:00
parent 50379e7cd3
commit 5635e3b01c
1 changed files with 5 additions and 4 deletions
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9
dbms/src/Common/Allocator.h
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@ -76,7 +76,7 @@ namespace AllocatorHints
{ {
struct DefaultHint struct DefaultHint
{ {
static void * mmap_hint() void * mmap_hint()
{ {
return nullptr; return nullptr;
} }
@ -84,11 +84,12 @@ struct DefaultHint
struct RandomHint struct RandomHint
{ {
static void * mmap_hint() void * mmap_hint()
{ {
static auto rng = pcg64{randomSeed()};
return reinterpret_cast<void *>(std::uniform_int_distribution<intptr_t>(0x100000000000UL, 0x700000000000UL)(rng)); return reinterpret_cast<void *>(std::uniform_int_distribution<intptr_t>(0x100000000000UL, 0x700000000000UL)(rng));
} }
private:
pcg64 rng{randomSeed()};
}; };
} }
@ -103,7 +104,7 @@ struct RandomHint
* - mmap_threshold for using mmap less or more * - mmap_threshold for using mmap less or more
*/ */
template <bool clear_memory_, typename Hint, size_t mmap_threshold> template <bool clear_memory_, typename Hint, size_t mmap_threshold>
class AllocatorWithHint class AllocatorWithHint : Hint
{ {
protected: protected:
static constexpr bool clear_memory = clear_memory_; static constexpr bool clear_memory = clear_memory_;