commit 6e767bf8acc3ccabbf5534d3788404952a6c15e9
author William A. Kennington III <wak@google.com> Mon Jul 24 17:08:45 2023 -0700
committer William A. Kennington III <wak@google.com> Mon Jul 24 19:46:11 2023 -0700
tree 0600534b10a5c4572133d3e5b187ea26306ec717
parent 178cfda8273ec360b50a47f57520ece3c2c70b0a

str/cat: Implement StrBuf appending

Change-Id: I67841cc8fb54808754bb5e37d7ece14786c3ae8a
Signed-off-by: William A. Kennington III <wak@google.com>

include/stdplus/str/cat.hpp

diff --git a/include/stdplus/str/cat.hpp b/include/stdplus/str/cat.hpp
index 6ce7ee3..f717abc 100644
--- a/include/stdplus/str/cat.hpp
+++ b/include/stdplus/str/cat.hpp
@@ -5,6 +5,10 @@
 
 namespace stdplus
 {
+
+template <typename CharT, std::size_t ObjSize, typename Alloc>
+class BasicStrBuf;
+
 namespace detail
 {
 
@@ -15,6 +19,14 @@
     dst.reserve((dst.size() + ... + strs.size()));
     (dst.append(strs), ...);
 }
+template <typename CharT, std::size_t ObjSize, typename Alloc,
+          typename... CharTs>
+constexpr void strAppend(stdplus::BasicStrBuf<CharT, ObjSize, Alloc>& dst,
+                         std::basic_string_view<CharTs>... strs)
+{
+    [[maybe_unused]] auto out = dst.append((strs.size() + ... + 0));
+    ((out = std::copy(strs.begin(), strs.end(), out)), ...);
+}
 
 template <typename CharT>
 struct DedSV : std::basic_string_view<CharT>

test/str/cat.cpp

diff --git a/test/str/cat.cpp b/test/str/cat.cpp
index ef958ea..a61800f 100644
--- a/test/str/cat.cpp
+++ b/test/str/cat.cpp
@@ -1,3 +1,4 @@
+#include <stdplus/str/buf.hpp>
 #include <stdplus/str/cat.hpp>
 #include <stdplus/zstring_view.hpp>
 
@@ -34,4 +35,13 @@
     EXPECT_EQ("func world", strCat("func"s, " world"));
 }
 
+TEST(StrAppend, Buf)
+{
+    StrBuf buf;
+    strAppend(buf, "a ");
+    strAppend(buf);
+    strAppend(buf, "b"s, " c"sv);
+    EXPECT_EQ("a b c", buf);
+}
+
 } // namespace stdplus