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authorBoris Kolpackov <boris@codesynthesis.com>2017-01-12 12:06:51 +0200
committerBoris Kolpackov <boris@codesynthesis.com>2017-01-12 12:06:51 +0200
commitce492a427632cc7da9607a6a5a53a7a996411226 (patch)
treeefa3f11e673a58174ab1b6d7389e5f783220f77c /butl
parent9a81c308f2d4217592630ef41a18a8998bd66f5c (diff)
Add small_vector workaround for VC
Diffstat (limited to 'butl')
-rw-r--r--butl/small-vector38
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;
}