[libc++][format] Improve format-arg-store.
This optimizes the __format_arg_store type to allow a more efficient
storage of the basic_format_args.
It stores the data in two arrays:
- A struct with the tag of the exposition only variant's type and the
offset of the element in the data array. Since this array only depends
on the type information it's calculated at compile time and can be
shared by different instances of this class.
- The arguments converted to the types used in the exposition only
variant of basic_format_arg. This means the packed data can be
directly copied to an element of this variant.
The new code uses rvalue reference arguments in preparation for P2418.
The handle class also has some changes to prepare for P2418. The real
changed for P2418 will be done separately, but these parts make it
easier to implement that paper.
Some parts of existing test code are removed since they were no longer
valid after the changes, but new tests have been added.
Implements parts of:
- P2418 Add support for std::generator-like types to std::format
Completes:
- LWG3473 Normative encouragement in non-normative note
Depends on D121138
Reviewed By: #libc, vitaut, Mordante
Differential Revision: https://reviews.llvm.org/D121514
NOKEYCHECK=True
GitOrigin-RevId: 4d8268fbf4cd30d39530622b7f1dc487122b4f3c
diff --git a/include/module.modulemap b/include/module.modulemap
index ef97b81..8796955 100644
--- a/include/module.modulemap
+++ b/include/module.modulemap
@@ -545,6 +545,7 @@
module concepts { private header "__format/concepts.h" }
module enable_insertable { private header "__format/enable_insertable.h" }
module format_arg { private header "__format/format_arg.h" }
+ module format_arg_store { private header "__format/format_arg_store.h" }
module format_args { private header "__format/format_args.h" }
module format_context {
private header "__format/format_context.h"