本文整理汇总了C++中MapVector::begin方法的典型用法代码示例。如果您正苦于以下问题：C++ MapVector::begin方法的具体用法？C++ MapVector::begin怎么用？C++ MapVector::begin使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类MapVector的用法示例。
在下文中一共展示了MapVector::begin方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1:
TEST(MapVectorTest, insert) {
MapVector<int, int> MV;
std::pair<MapVector<int, int>::iterator, bool> R;
R = MV.insert(std::make_pair(1, 2));
ASSERT_EQ(R.first, MV.begin());
EXPECT_EQ(R.first->first, 1);
EXPECT_EQ(R.first->second, 2);
EXPECT_TRUE(R.second);
R = MV.insert(std::make_pair(1, 3));
ASSERT_EQ(R.first, MV.begin());
EXPECT_EQ(R.first->first, 1);
EXPECT_EQ(R.first->second, 2);
EXPECT_FALSE(R.second);
R = MV.insert(std::make_pair(4, 5));
ASSERT_NE(R.first, MV.end());
EXPECT_EQ(R.first->first, 4);
EXPECT_EQ(R.first->second, 5);
EXPECT_TRUE(R.second);
EXPECT_EQ(MV.size(), 2u);
EXPECT_EQ(MV[1], 2);
EXPECT_EQ(MV[4], 5);
}示例2: Buckets
static void
writeIndex(MCStreamer &Out, MCSection *Section,
ArrayRef<unsigned> ContributionOffsets,
const MapVector<uint64_t, UnitIndexEntry> &IndexEntries) {
if (IndexEntries.empty())
return;
unsigned Columns = 0;
for (auto &C : ContributionOffsets)
if (C)
++Columns;
std::vector<unsigned> Buckets(NextPowerOf2(3 * IndexEntries.size() / 2));
uint64_t Mask = Buckets.size() - 1;
size_t i = 0;
for (const auto &P : IndexEntries) {
auto S = P.first;
auto H = S & Mask;
auto HP = ((S >> 32) & Mask) | 1;
while (Buckets[H]) {
assert(S != IndexEntries.begin()[Buckets[H] - 1].first &&
"Duplicate unit");
H = (H + HP) & Mask;
}
Buckets[H] = i + 1;
++i;
}
Out.SwitchSection(Section);
Out.EmitIntValue(2, 4); // Version
Out.EmitIntValue(Columns, 4); // Columns
Out.EmitIntValue(IndexEntries.size(), 4); // Num Units
Out.EmitIntValue(Buckets.size(), 4); // Num Buckets
// Write the signatures.
for (const auto &I : Buckets)
Out.EmitIntValue(I ? IndexEntries.begin()[I - 1].first : 0, 8);
// Write the indexes.
for (const auto &I : Buckets)
Out.EmitIntValue(I, 4);
// Write the column headers (which sections will appear in the table)
for (size_t i = 0; i != ContributionOffsets.size(); ++i)
if (ContributionOffsets[i])
Out.EmitIntValue(i + DW_SECT_INFO, 4);
// Write the offsets.
writeIndexTable(Out, ContributionOffsets, IndexEntries,
&DWARFUnitIndex::Entry::SectionContribution::Offset);
// Write the lengths.
writeIndexTable(Out, ContributionOffsets, IndexEntries,
&DWARFUnitIndex::Entry::SectionContribution::Length);
}