Use InlinedVector

absl/strings/BUILD.bazel

@@ -1169,6 +1169,7 @@ cc_library(
         ":strings",
         "//absl/base:config",
         "//absl/base:core_headers",
+        "//absl/container:inlined_vector",
         "//absl/functional:function_ref",
         "//absl/meta:type_traits",
         "//absl/numeric:bits",

absl/strings/internal/str_format/bind.h

@@ -21,6 +21,7 @@
 #include <string>
 
 #include "absl/base/port.h"
+#include "absl/container/inlined_vector.h"
 #include "absl/strings/internal/str_format/arg.h"
 #include "absl/strings/internal/str_format/checker.h"
 #include "absl/strings/internal/str_format/parser.h"
@@ -177,17 +178,7 @@ class Streamable {
  public:
   Streamable(const UntypedFormatSpecImpl& format,
              absl::Span<const FormatArgImpl> args)
-      : format_(format) {
-    if (args.size() <= ABSL_ARRAYSIZE(few_args_)) {
-      for (size_t i = 0; i < args.size(); ++i) {
-        few_args_[i] = args[i];
-      }
-      args_ = absl::MakeSpan(few_args_, args.size());
-    } else {
-      many_args_.assign(args.begin(), args.end());
-      args_ = many_args_;
-    }
-  }
+      : format_(format), args_(args.begin(), args.end()) { }
 
   std::ostream& Print(std::ostream& os) const;
 
@@ -197,12 +188,7 @@ class Streamable {
 
  private:
   const UntypedFormatSpecImpl& format_;
-  absl::Span<const FormatArgImpl> args_;
-  // if args_.size() is 4 or less:
-  FormatArgImpl few_args_[4] = {FormatArgImpl(0), FormatArgImpl(0),
-                                FormatArgImpl(0), FormatArgImpl(0)};
-  // if args_.size() is more than 4:
-  std::vector<FormatArgImpl> many_args_;
+  absl::InlinedVector<FormatArgImpl, 4> args_;
 };
 
 // for testing