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#include "DataFormats/Provenance/interface/Parentage.h"
#include "FWCore/Utilities/interface/Digest.h"
#include <charconv>
#include <sstream>
//#include <cassert>
/*----------------------------------------------------------------------
----------------------------------------------------------------------*/
namespace edm {
Parentage::Parentage() : parents_() {}
Parentage::Parentage(std::vector<BranchID> const& parents) : parents_(parents) {}
Parentage::Parentage(std::vector<BranchID>&& parents) : parents_(std::move(parents)) {}
ParentageID Parentage::id() const {
//10 is the maximum number of digits for a 2^32 number
std::array<char, 10 + 1> buf;
cms::Digest md5alg;
for (auto const& parent : parents_) {
//assert(start < end);
auto res = std::to_chars(buf.data(), buf.data() + buf.size(), parent.id());
//assert(res.ec == std::errc());
*res.ptr = ' ';
md5alg.append(buf.data(), res.ptr - buf.data() + 1);
}
ParentageID id(md5alg.digest().bytes);
return id;
}
void Parentage::write(std::ostream&) const {
// This is grossly inadequate, but it is not critical for the
// first pass.
}
bool operator==(Parentage const& a, Parentage const& b) { return a.parents() == b.parents(); }
} // namespace edm
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