Preallocate vector

test/op_shape_test.cpp

@@ -10,9 +10,10 @@ void expect_shape(migraph::shape expected, migraph::operation op, Ts... xs)
 {
     migraph::program p;
     std::vector<migraph::shape> shapes{xs...};
-    std::vector<migraph::instruction_ref> args;
-    for(auto&& s : shapes)
-        args.push_back(p.add_outline(s));
+    std::vector<migraph::instruction_ref> args(shapes.size());
+    std::transform(shapes.begin(), shapes.end(), args.begin(), [&](auto&& s) {
+        return p.add_outline(s);
+    });
     p.add_instruction(op, args);
     if(p.get_shape() != expected)
     {
@@ -28,9 +29,10 @@ void throws_shape(migraph::operation op, Ts... xs)
 {
     migraph::program p;
     std::vector<migraph::shape> shapes{xs...};
-    std::vector<migraph::instruction_ref> args;
-    for(auto&& s : shapes)
-        args.push_back(p.add_outline(s));
+    std::vector<migraph::instruction_ref> args(shapes.size());
+    std::transform(shapes.begin(), shapes.end(), args.begin(), [&](auto&& s) {
+        return p.add_outline(s);
+    });
     bool thrown = test::throws([&] { p.add_instruction(op, args); });
     if(not thrown)
     {