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//===--- STLExtras.h - Helper STL related templates -------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Helper templates for using with the STL.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_INDEX_STLEXTRAS_H
#define LLVM_CLANG_INDEX_STLEXTRAS_H
namespace clang {
namespace idx {
/// \brief Wraps an iterator whose value_type is a pair, and provides
/// pair's second object as the value.
template <typename iter_type>
class pair_value_iterator {
iter_type I;
public:
typedef typename iter_type::value_type::second_type value_type;
typedef value_type& reference;
typedef value_type* pointer;
typedef typename iter_type::iterator_category iterator_category;
typedef typename iter_type::difference_type difference_type;
pair_value_iterator() { }
pair_value_iterator(iter_type i) : I(i) { }
reference operator*() const { return I->second; }
pointer operator->() const { return &I->second; }
pair_value_iterator& operator++() {
++I;
return *this;
}
pair_value_iterator operator++(int) {
pair_value_iterator tmp(*this);
++(*this);
return tmp;
}
friend bool operator==(pair_value_iterator L, pair_value_iterator R) {
return L.I == R.I;
}
friend bool operator!=(pair_value_iterator L, pair_value_iterator R) {
return L.I != R.I;
}
};
} // end idx namespace
} // end clang namespace
#endif
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