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Changes imported from Abseil "staging" branch:

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- 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
This commit is contained in:
Abseil Team 2017-12-14 12:36:12 -08:00 • committed by Titus Winters
parent 720c017e30
commit 6280bddf55
5 changed files with 233 additions and 181 deletions
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26
absl/strings/numbers.h
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@ -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);
}
}
}