mdebray/tvl-depot
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Changes imported from Abseil "staging" branch:

Browse source 
- 8dea174f3f4178dd8b428e5cf73c37c4eefeb2ea Minor style changes and reorganization. Add missing copyr... by Alex Strelnikov <strel@google.com>

GitOrigin-RevId: 8dea174f3f4178dd8b428e5cf73c37c4eefeb2ea
Change-Id: I239f9dd6882172790b241f1af7a2acb23d54fb61
This commit is contained in:
Abseil Team 2018-01-09 08:46:23 -08:00 • committed by Derek Mauro
parent 4132ce2595
commit 25274b35a0
4 changed files with 64 additions and 28 deletions
Download patch file Download diff file Expand all files Collapse all files

34
absl/numeric/int128.cc
View file

@ -139,9 +139,9 @@ uint128& uint128::operator%=(uint128 other) {
return *this;
}
std::ostream& operator<<(std::ostream& o, uint128 b) {
std::ios_base::fmtflags flags = o.flags();
namespace {
std::string Uint128ToFormattedString(uint128 v, std::ios_base::fmtflags flags) {
// Select a divisor which is the largest power of the base < 2^64.
uint128 div;
int div_base_log;
@ -160,14 +160,14 @@ std::ostream& operator<<(std::ostream& o, uint128 b) {
break;
}
// Now piece together the uint128 representation from three chunks of
// the original value, each less than "div" and therefore representable
// as a uint64_t.
// Now piece together the uint128 representation from three chunks of the
// original value, each less than "div" and therefore representable as a
// uint64_t.
std::ostringstream os;
std::ios_base::fmtflags copy_mask =
std::ios::basefield | std::ios::showbase | std::ios::uppercase;
os.setf(flags & copy_mask, copy_mask);
uint128 high = b;
uint128 high = v;
uint128 low;
DivModImpl(high, div, &high, &low);
uint128 mid;
@ -182,25 +182,31 @@ std::ostream& operator<<(std::ostream& o, uint128 b) {
os << std::noshowbase << std::setfill('0') << std::setw(div_base_log);
}
os << Uint128Low64(low);
std::string rep = os.str();
return os.str();
}
} // namespace
std::ostream& operator<<(std::ostream& os, uint128 v) {
std::ios_base::fmtflags flags = os.flags();
std::string rep = Uint128ToFormattedString(v, flags);
// Add the requisite padding.
std::streamsize width = o.width(0);
std::streamsize width = os.width(0);
if (static_cast<size_t>(width) > rep.size()) {
std::ios::fmtflags adjustfield = flags & std::ios::adjustfield;
if (adjustfield == std::ios::left) {
rep.append(width - rep.size(), o.fill());
rep.append(width - rep.size(), os.fill());
} else if (adjustfield == std::ios::internal &&
(flags & std::ios::showbase) &&
(flags & std::ios::basefield) == std::ios::hex && b != 0) {
rep.insert(2, width - rep.size(), o.fill());
(flags & std::ios::basefield) == std::ios::hex && v != 0) {
rep.insert(2, width - rep.size(), os.fill());
} else {
rep.insert(0, width - rep.size(), o.fill());
rep.insert(0, width - rep.size(), os.fill());
}
}
// Stream the final representation in a single "<<" call.
return o << rep;
return os << rep;
}
} // namespace absl