diff options
Diffstat (limited to 'butl/small-vector')
| -rw-r--r-- | butl/small-vector | 38 |
1 files changed, 28 insertions, 10 deletions
diff --git a/butl/small-vector b/butl/small-vector index bcb2ddb..8880ffe 100644 --- a/butl/small-vector +++ b/butl/small-vector @@ -55,9 +55,10 @@ namespace butl T* allocate(std::size_t n) { + assert (n >= N); // We should never be asked for less than N. + if (n <= N) { - assert (buf_->free_); // Why would we need another small buffer? buf_->free_ = false; return reinterpret_cast<T*> (buf_->data_); } @@ -198,15 +199,6 @@ namespace butl static_cast<base_type&> (*this) = v; } - small_vector (small_vector&& v) - : base_type (allocator_type (this)) - { - if (v.size () <= N) - reserve (); - - static_cast<base_type&> (*this) = std::move (v); - } - small_vector& operator= (const small_vector& v) { @@ -216,12 +208,38 @@ namespace butl return *this; } + small_vector (small_vector&& v) + : base_type (allocator_type (this)) + { + if (v.size () <= N) + reserve (); + + *this = std::move (v); // Delegate to operator=(&&). + } + small_vector& operator= (small_vector&& v) { + // VC's implementation of operator=(&&) (both 14 and 15) frees the + // memory and then reallocated with capacity equal to v.size(). This is + // clearly sub-optimal (the existing buffer could be reused) so we hope + // this will be fixed eventually. + // +#if defined(_MSC_VER) && _MSC_VER <= 1910 + if (v.size () < N) + { + clear (); + for (T& x: v) + push_back (std::move (x)); + v.clear (); + } + else +#endif + // Note: propagate_on_container_move_assignment = false // static_cast<base_type&> (*this) = std::move (v); + return *this; } |