diff options
| -rw-r--r-- | absl/strings/str_cat.cc | 16 | ||||
| -rw-r--r-- | absl/strings/str_cat_test.cc | 47 |
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> |