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Added suggestion from Nikolay Kochetov #3720

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This commit is contained in:
Alexey Milovidov 2018-11-30 22:47:47 +03:00
parent 621e622f79
commit be80b7b188
1 changed files with 11 additions and 0 deletions
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11
dbms/src/IO/WriteBufferFromVector.h
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@ -8,6 +8,11 @@
namespace DB
{
namespace ErrorCodes
{
extern const int CANNOT_WRITE_AFTER_END_OF_BUFFER;
}
/** Writes data to existing std::vector or similar type. When not enough space, it doubles vector size.
*
* In destructor, vector is cutted to the size of written data.
@ -24,6 +29,9 @@ private:
void nextImpl() override
{
if (is_finished)
throw Exception("WriteBufferFromVector is finished", ErrorCodes::CANNOT_WRITE_AFTER_END_OF_BUFFER);
size_t old_size = vector.size();
vector.resize(old_size * 2);
internal_buffer = Buffer(reinterpret_cast<Position>(&vector[old_size]), reinterpret_cast<Position>(vector.data() + vector.size()));
@ -49,6 +57,9 @@ public:
((position() - reinterpret_cast<Position>(vector.data()))
+ sizeof(typename VectorType::value_type) - 1) /// Align up.
/ sizeof(typename VectorType::value_type));
/// Prevent further writes.
set(nullptr, 0);
}
~WriteBufferFromVector() override