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// file : build/key_set -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
// license : MIT; see accompanying LICENSE file
#ifndef BUILD_KEY_SET
#define BUILD_KEY_SET
namespace build
{
// Google the "Emulating Boost.MultiIndex with Standard Containers" blog
// post for deatils.
//
template <typename T>
struct set_key
{
mutable const T* p;
set_key (const T* v = 0): p (v) {}
bool operator< (const set_key& x) const {return *p < *x.p;}
};
template <typename I>
struct map_iterator_adapter: I
{
typedef const typename I::value_type::second_type value_type;
typedef value_type* pointer;
typedef value_type& reference;
map_iterator_adapter () {}
map_iterator_adapter (I i): I (i) {}
map_iterator_adapter&
operator= (I i) {static_cast<I&> (*this) = i; return *this;}
reference operator* () const {return I::operator* ().second;}
pointer operator-> () const {return &I::operator-> ()->second;}
};
}
#endif // BUILD_KEY_SET
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