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ENH: PtrList, PtrDynList, HashPtrTable try_emplace() method

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- naming like std::map::try_emplace(), it behaves like emplace_set()
  if there is no element at the given location otherwise a no-op

ENH: reuse existing HashPtrTable 'slot' when setting pointers

- avoids extra HashTable operations
This commit is contained in:
Mark Olesen
2023-07-25 15:45:23 +02:00
parent 11a1f78338
commit 03ca52b036
11 changed files with 190 additions and 85 deletions
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41
applications/test/HashPtrTable/Test-HashPtrTable.C
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@ -44,38 +44,28 @@ class Scalar
public:
Scalar()
:
data_(0)
{}
static bool verbose;
Scalar(scalar val)
:
data_(val)
{}
constexpr Scalar() noexcept : data_(0) {}
Scalar(scalar val) noexcept : data_(val) {}
~Scalar()
{
Info<<"delete Scalar: " << data_ << endl;
if (verbose) Info<< "delete Scalar: " << data_ << endl;
}
const scalar& value() const
{
return data_;
}
const scalar& value() const noexcept { return data_; }
scalar& value() noexcept { return data_; }
scalar& value()
friend Ostream& operator<<(Ostream& os, const Scalar& item)
{
return data_;
}
friend Ostream& operator<<(Ostream& os, const Scalar& val)
{
os << val.data_;
os << item.value();
return os;
}
};
bool Scalar::verbose = true;
template<class T>
void printTable(const HashPtrTable<T>& table)
@ -129,6 +119,9 @@ int main()
myTable.set("natlog", new double(2.718282));
myTable.insert("sqrt2", autoPtr<double>::New(1.414214));
myTable.insert("euler", autoPtr<double>::New(0.577216));
myTable.set("def_0", nullptr);
myTable.emplace_set("def_1", 123);
myTable.emplace_set("def_2", 456);
HashTable<std::unique_ptr<double>> myTable1;
@ -146,6 +139,14 @@ int main()
Info<< "Initial table" << nl;
printTable(myTable);
myTable.try_emplace("def_0", 1000); // was nullptr, now value
myTable.try_emplace("def_1", 1001); // no-op
myTable.try_emplace("def_2", 1002); // no-op;
myTable.try_emplace("def_3", 1003); // was non-existent, now value
Info<< "after try_emplace" << nl;
printTable(myTable);
Info<< "print" << nl;
Info<< myTable2 << nl;