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-rw-r--r--absl/strings/str_cat.cc16
-rw-r--r--absl/strings/str_cat_test.cc47
2 files changed, 51 insertions, 12 deletions
diff --git a/absl/strings/str_cat.cc b/absl/strings/str_cat.cc
index ffe99db8..99619445 100644
--- a/absl/strings/str_cat.cc
+++ b/absl/strings/str_cat.cc
@@ -99,7 +99,7 @@ std::string StrCat(const AlphaNum& a, const AlphaNum& b) {
std::string result;
absl::strings_internal::STLStringResizeUninitialized(&result,
a.size() + b.size());
- char* const begin = &*result.begin();
+ char* const begin = &result[0];
char* out = begin;
out = Append(out, a);
out = Append(out, b);
@@ -111,7 +111,7 @@ std::string StrCat(const AlphaNum& a, const AlphaNum& b, const AlphaNum& c) {
std::string result;
strings_internal::STLStringResizeUninitialized(
&result, a.size() + b.size() + c.size());
- char* const begin = &*result.begin();
+ char* const begin = &result[0];
char* out = begin;
out = Append(out, a);
out = Append(out, b);
@@ -125,7 +125,7 @@ std::string StrCat(const AlphaNum& a, const AlphaNum& b, const AlphaNum& c,
std::string result;
strings_internal::STLStringResizeUninitialized(
&result, a.size() + b.size() + c.size() + d.size());
- char* const begin = &*result.begin();
+ char* const begin = &result[0];
char* out = begin;
out = Append(out, a);
out = Append(out, b);
@@ -144,7 +144,7 @@ std::string CatPieces(std::initializer_list<absl::string_view> pieces) {
for (const absl::string_view piece : pieces) total_size += piece.size();
strings_internal::STLStringResizeUninitialized(&result, total_size);
- char* const begin = &*result.begin();
+ char* const begin = &result[0];
char* out = begin;
for (const absl::string_view piece : pieces) {
const size_t this_size = piece.size();
@@ -176,7 +176,7 @@ void AppendPieces(std::string* dest,
}
strings_internal::STLStringResizeUninitialized(dest, total_size);
- char* const begin = &*dest->begin();
+ char* const begin = &(*dest)[0];
char* out = begin + old_size;
for (const absl::string_view piece : pieces) {
const size_t this_size = piece.size();
@@ -201,7 +201,7 @@ void StrAppend(std::string* dest, const AlphaNum& a, const AlphaNum& b) {
std::string::size_type old_size = dest->size();
strings_internal::STLStringResizeUninitialized(
dest, old_size + a.size() + b.size());
- char* const begin = &*dest->begin();
+ char* const begin = &(*dest)[0];
char* out = begin + old_size;
out = Append(out, a);
out = Append(out, b);
@@ -216,7 +216,7 @@ void StrAppend(std::string* dest, const AlphaNum& a, const AlphaNum& b,
std::string::size_type old_size = dest->size();
strings_internal::STLStringResizeUninitialized(
dest, old_size + a.size() + b.size() + c.size());
- char* const begin = &*dest->begin();
+ char* const begin = &(*dest)[0];
char* out = begin + old_size;
out = Append(out, a);
out = Append(out, b);
@@ -233,7 +233,7 @@ void StrAppend(std::string* dest, const AlphaNum& a, const AlphaNum& b,
std::string::size_type old_size = dest->size();
strings_internal::STLStringResizeUninitialized(
dest, old_size + a.size() + b.size() + c.size() + d.size());
- char* const begin = &*dest->begin();
+ char* const begin = &(*dest)[0];
char* out = begin + old_size;
out = Append(out, a);
out = Append(out, b);
diff --git a/absl/strings/str_cat_test.cc b/absl/strings/str_cat_test.cc
index 29db9c02..be39880b 100644
--- a/absl/strings/str_cat_test.cc
+++ b/absl/strings/str_cat_test.cc
@@ -195,6 +195,21 @@ TEST(StrCat, Basics) {
EXPECT_EQ(result, "12333444455555666666777777788888888999999999");
}
+TEST(StrCat, CornerCases) {
+ std::string result;
+
+ result = absl::StrCat(""); // NOLINT
+ EXPECT_EQ(result, "");
+ result = absl::StrCat("", "");
+ EXPECT_EQ(result, "");
+ result = absl::StrCat("", "", "");
+ EXPECT_EQ(result, "");
+ result = absl::StrCat("", "", "", "");
+ EXPECT_EQ(result, "");
+ result = absl::StrCat("", "", "", "", "");
+ EXPECT_EQ(result, "");
+}
+
// A minimal allocator that uses malloc().
template <typename T>
struct Mallocator {
@@ -433,10 +448,34 @@ TEST(StrAppend, Death) {
}
#endif // GTEST_HAS_DEATH_TEST
-TEST(StrAppend, EmptyString) {
- std::string s = "";
- absl::StrAppend(&s, s);
- EXPECT_EQ(s, "");
+TEST(StrAppend, CornerCases) {
+ std::string result;
+ absl::StrAppend(&result, "");
+ EXPECT_EQ(result, "");
+ absl::StrAppend(&result, "", "");
+ EXPECT_EQ(result, "");
+ absl::StrAppend(&result, "", "", "");
+ EXPECT_EQ(result, "");
+ absl::StrAppend(&result, "", "", "", "");
+ EXPECT_EQ(result, "");
+ absl::StrAppend(&result, "", "", "", "", "");
+ EXPECT_EQ(result, "");
+}
+
+TEST(StrAppend, CornerCasesNonEmptyAppend) {
+ for (std::string result : {"hello", "a std::string too long to fit in the SSO"}) {
+ const std::string expected = result;
+ absl::StrAppend(&result, "");
+ EXPECT_EQ(result, expected);
+ absl::StrAppend(&result, "", "");
+ EXPECT_EQ(result, expected);
+ absl::StrAppend(&result, "", "", "");
+ EXPECT_EQ(result, expected);
+ absl::StrAppend(&result, "", "", "", "");
+ EXPECT_EQ(result, expected);
+ absl::StrAppend(&result, "", "", "", "", "");
+ EXPECT_EQ(result, expected);
+ }
}
template <typename IntType>