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bitvect: add a is_subset_of method.

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* src/misc/bitvect.hh: New method.
* src/tgbatest/bitvect.cc, src/tgbatest/bitvect.test: Test it.
This commit is contained in:
Alexandre Duret-Lutz 2013-12-18 18:33:10 +01:00
parent 90a43db5a4
commit 9a097bb02e
3 changed files with 21 additions and 0 deletions
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17
src/misc/bitvect.hh
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@ -298,6 +298,23 @@ namespace spot
return *this;
}
bool is_subset_of(const bitvect& other) const
{
assert(other.block_count_ >= block_count_);
size_t i;
for (i = 0; i < block_count_ - 1; ++i)
if ((storage_[i] & other.storage_[i]) != other.storage_[i])
return false;
// The last block might not be fully used, compare only the
// relevant portion.
const size_t bpb = 8 * sizeof(bitvect::block_t);
block_t mask = (1UL << (size() % bpb)) - 1;
return ((storage_[i] & mask & other.storage_[i])
== (other.storage_[i] & mask));
}
bool operator==(const bitvect& other) const
{
if (other.size_ != size_)