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Add default index functor (an identity functor). You could use a
vector directly to get the same functionality but using a DenseMap makes the code more readable IMO. llvm-svn: 16052
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@ -24,39 +24,45 @@
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namespace llvm {
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template <typename T, typename ToIndexT>
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class DenseMap {
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struct IdentityFunctor : std::unary_function<unsigned, unsigned> {
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unsigned operator()(unsigned Index) const {
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return Index;
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}
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};
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template <typename T, typename ToIndexT = IdentityFunctor>
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class DenseMap {
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typedef typename ToIndexT::argument_type IndexT;
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typedef std::vector<T> StorageT;
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StorageT storage_;
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T nullVal_;
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ToIndexT toIndex_;
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public:
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public:
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DenseMap() : nullVal_(T()) { }
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explicit DenseMap(const T& val) : nullVal_(val) { }
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typename StorageT::reference operator[](IndexT n) {
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assert(toIndex_(n) < storage_.size() && "index out of bounds!");
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return storage_[toIndex_(n)];
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assert(toIndex_(n) < storage_.size() && "index out of bounds!");
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return storage_[toIndex_(n)];
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}
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typename StorageT::const_reference operator[](IndexT n) const {
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assert(toIndex_(n) < storage_.size() && "index out of bounds!");
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return storage_[toIndex_(n)];
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assert(toIndex_(n) < storage_.size() && "index out of bounds!");
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return storage_[toIndex_(n)];
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}
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void clear() {
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storage_.clear();
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storage_.clear();
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}
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void grow(IndexT n) {
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unsigned NewSize = toIndex_(n) + 1;
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if (NewSize > storage_.size())
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storage_.resize(NewSize, nullVal_);
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unsigned NewSize = toIndex_(n) + 1;
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if (NewSize > storage_.size())
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storage_.resize(NewSize, nullVal_);
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}
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};
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};
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} // End llvm namespace
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