gdb: add gdb::make_unique function

While GDB is still C++11, lets add a gdb::make_unique template
function that can be used to create std::unique_ptr objects, just like
the C++14 std::make_unique.

If GDB is being compiled with a C++14 compiler then the new
gdb::make_unique function will delegate to the std::make_unique.  I
checked with gcc, and at -O1 and above gdb::make_unique will be
optimised away completely in this case.

If C++14 (or later) becomes our minimum, then it will be easy enough
to go through the code and replace gdb::make_unique with
std::make_unique later on.

I've make use of this function in all the places I think this can
easily be used, though I'm sure I've probably missed some.

Should be no user visible changes after this commit.

Approved-By: Tom Tromey <tom@tromey.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/gdb/ui-out.c b/gdb/ui-out.c
index 9380630..b4b8e48 100644
--- a/gdb/ui-out.c
+++ b/gdb/ui-out.c
@@ -236,9 +236,9 @@ void ui_out_table::append_header (int width, ui_align alignment,
     internal_error (_("table header must be specified after table_begin and "
 		      "before table_body."));
 
-  std::unique_ptr<ui_out_hdr> header (new ui_out_hdr (m_headers.size () + 1,
-							width, alignment,
-							col_name, col_hdr));
+  auto header = gdb::make_unique<ui_out_hdr> (m_headers.size () + 1,
+					      width, alignment,
+					      col_name, col_hdr);
 
   m_headers.push_back (std::move (header));
 }
@@ -328,7 +328,7 @@ ui_out::current_level () const
 void
 ui_out::push_level (ui_out_type type)
 {
-  std::unique_ptr<ui_out_level> level (new ui_out_level (type));
+  auto level = gdb::make_unique<ui_out_level> (type);
 
   m_levels.push_back (std::move (level));
 }