diff options
author | 2017-12-14 12:36:12 -0800 | |
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committer | 2017-12-15 08:52:46 -0500 | |
commit | 6280bddf55e675219cacc25a6a12bc5ddc0fdc74 (patch) | |
tree | 15b87def4e6978fa40eee2cb8db76302bedc7282 /absl/strings/numbers.h | |
parent | 720c017e30339fd1786ce4aac68bc8559736e53f (diff) |
Changes imported from Abseil "staging" branch:
- 8320b38cd9f4f271fb6b278bd1e10d93f6ac3856 Use overloads for int32/int64/uint32/uint64 rather than i... by Jorg Brown <jorg@google.com>
- f8b582b8deb3f78a3c6de2114b3ec4640f5427dd Internal change by Juemin Yang <jueminyang@google.com>
- 240ff55ebf493ab1233ebe6976853a5fa2b3ec46 Remove the internal LowLevelAlloc's dependence on kLinker... by Greg Falcon <gfalcon@google.com>
GitOrigin-RevId: 8320b38cd9f4f271fb6b278bd1e10d93f6ac3856
Change-Id: If5004efa2b43856948390ab357b8e9403e4461b4
Diffstat (limited to 'absl/strings/numbers.h')
-rw-r--r-- | absl/strings/numbers.h | 26 |
1 files changed, 14 insertions, 12 deletions
diff --git a/absl/strings/numbers.h b/absl/strings/numbers.h index 1f3bbcfa..adf706a4 100644 --- a/absl/strings/numbers.h +++ b/absl/strings/numbers.h @@ -81,14 +81,6 @@ bool safe_strto64_base(absl::string_view text, int64_t* value, int base); bool safe_strtou32_base(absl::string_view text, uint32_t* value, int base); bool safe_strtou64_base(absl::string_view text, uint64_t* value, int base); -// These functions are intended for speed. All functions take an output buffer -// as an argument and return a pointer to the last byte they wrote, which is the -// terminating '\0'. At most `kFastToBufferSize` bytes are written. -char* FastInt32ToBuffer(int32_t i, char* buffer); -char* FastUInt32ToBuffer(uint32_t i, char* buffer); -char* FastInt64ToBuffer(int64_t i, char* buffer); -char* FastUInt64ToBuffer(uint64_t i, char* buffer); - static const int kFastToBufferSize = 32; static const int kSixDigitsToBufferSize = 16; @@ -100,6 +92,16 @@ static const int kSixDigitsToBufferSize = 16; // Required buffer size is `kSixDigitsToBufferSize`. size_t SixDigitsToBuffer(double d, char* buffer); +// These functions are intended for speed. All functions take an output buffer +// as an argument and return a pointer to the last byte they wrote, which is the +// terminating '\0'. At most `kFastToBufferSize` bytes are written. +char* FastIntToBuffer(int32_t, char*); +char* FastIntToBuffer(uint32_t, char*); +char* FastIntToBuffer(int64_t, char*); +char* FastIntToBuffer(uint64_t, char*); + +// For enums and integer types that are not an exact match for the types above, +// use templates to call the appropriate one of the four overloads above. template <typename int_type> char* FastIntToBuffer(int_type i, char* buffer) { static_assert(sizeof(i) <= 64 / 8, @@ -109,15 +111,15 @@ char* FastIntToBuffer(int_type i, char* buffer) { // If one day something like std::is_signed<enum E> works, switch to it. if (static_cast<int_type>(1) - 2 < 0) { // Signed if (sizeof(i) > 32 / 8) { // 33-bit to 64-bit - return numbers_internal::FastInt64ToBuffer(i, buffer); + return FastIntToBuffer(static_cast<int64_t>(i), buffer); } else { // 32-bit or less - return numbers_internal::FastInt32ToBuffer(i, buffer); + return FastIntToBuffer(static_cast<int32_t>(i), buffer); } } else { // Unsigned if (sizeof(i) > 32 / 8) { // 33-bit to 64-bit - return numbers_internal::FastUInt64ToBuffer(i, buffer); + return FastIntToBuffer(static_cast<uint64_t>(i), buffer); } else { // 32-bit or less - return numbers_internal::FastUInt32ToBuffer(i, buffer); + return FastIntToBuffer(static_cast<uint32_t>(i), buffer); } } } |