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Changes imported from Abseil "staging" branch:

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- a0405e7870a80a9dbc6784b06795e7df5a8c90f5 Internal change by Daniel Katz <katzdm@google.com>
  - 2888fe17796d7afa45f4b6ca7eb8e88f52739c39 StrCat: Support zero-padding and space-padding for decima... by Jorg Brown <jorg@google.com>
  - feebc521195241783730df9700394f6585550ff2 Merge GitHub PR #91. by Derek Mauro <dmauro@google.com>
  - e8164335efefb7335f407c17a16fce2ba4f24e3e This changes the value base_internal::kOnceDone from 32-b... by Abseil Team <absl-team@google.com>
  - 0f6085f3f0ee1d6baf9a558d07a25c2fcde93273 Remove `compliant` field from some type trait structs. by Matt Armstrong <marmstrong@google.com>

GitOrigin-RevId: a0405e7870a80a9dbc6784b06795e7df5a8c90f5
Change-Id: Ic2efd40f6ec35f79a8aa12d4475cbea3150756d7
This commit is contained in:
Abseil Team 2018-02-09 11:56:54 -08:00 • committed by Daniel Katz
parent 4791df7d1a
commit 0dc82b9d55
6 changed files with 151 additions and 18 deletions
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31
absl/strings/str_cat.cc
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@ -45,6 +45,37 @@ AlphaNum::AlphaNum(Hex hex) {
piece_ = absl::string_view(beg, end - beg);
}
AlphaNum::AlphaNum(Dec dec) {
assert(dec.width <= numbers_internal::kFastToBufferSize);
char* const end = &digits_[numbers_internal::kFastToBufferSize];
char* const minfill = end - dec.width;
char* writer = end;
uint64_t value = dec.value;
bool neg = dec.neg;
while (value > 9) {
*--writer = '0' + (value % 10);
value /= 10;
}
*--writer = '0' + value;
if (neg) *--writer = '-';
ptrdiff_t fillers = writer - minfill;
if (fillers > 0) {
// Tricky: if the fill character is ' ', then it's <fill><+/-><digits>
// But...: if the fill character is '0', then it's <+/-><fill><digits>
bool add_sign_again = false;
if (neg && dec.fill == '0') { // If filling with '0',
++writer; // ignore the sign we just added
add_sign_again = true; // and re-add the sign later.
}
writer -= fillers;
std::fill_n(writer, fillers, dec.fill);
if (add_sign_again) *--writer = '-';
}
piece_ = absl::string_view(writer, end - writer);
}
// ----------------------------------------------------------------------
// StrCat()
// This merges the given strings or integers, with no delimiter. This