// Copyright (c) 2013 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef TOOLS_GN_LABEL_PTR_H_ #define TOOLS_GN_LABEL_PTR_H_ #include <functional> class ParseNode; // Structure that holds a labeled "thing". This is used for various places // where we need to store lists of targets or configs. We sometimes populate // the pointers on another thread from where we compute the labels, so this // structure lets us save them separately. This also allows us to store the // location of the thing that added this dependency. template<typename T> struct LabelPtrPair { typedef T DestType; LabelPtrPair() : label(), ptr(NULL), origin(NULL) {} explicit LabelPtrPair(const Label& l) : label(l), ptr(NULL), origin(NULL) { } // This contructor is typically used in unit tests, it extracts the label // automatically from a given pointer. explicit LabelPtrPair(const T* p) : label(p->label()), ptr(p), origin(NULL) { } ~LabelPtrPair() {} Label label; const T* ptr; // May be NULL. const ParseNode* origin; // May be NULL. }; typedef LabelPtrPair<Config> LabelConfigPair; typedef LabelPtrPair<Target> LabelTargetPair; typedef std::vector<LabelConfigPair> LabelConfigVector; typedef std::vector<LabelTargetPair> LabelTargetVector; // Comparison and search functions --------------------------------------------- // To do a brute-force search by label: // std::find_if(vect.begin(), vect.end(), LabelPtrLabelEquals<Config>(label)); template<typename T> struct LabelPtrLabelEquals : public std::unary_function<Label, bool> { explicit LabelPtrLabelEquals(const Label& l) : label(l) {} bool operator()(const LabelPtrPair<T>& arg) const { return arg.label == label; } const Label& label; }; // To do a brute-force search by object pointer: // std::find_if(vect.begin(), vect.end(), LabelPtrLabelEquals<Config>(config)); template<typename T> struct LabelPtrPtrEquals : public std::unary_function<T, bool> { explicit LabelPtrPtrEquals(const T* p) : ptr(p) {} bool operator()(const LabelPtrPair<T>& arg) const { return arg.ptr == ptr; } const T* ptr; }; // To sort by label: // std::sort(vect.begin(), vect.end(), LabelPtrLabelLess<Config>()); template<typename T> struct LabelPtrLabelLess : public std::binary_function<LabelPtrPair<T>, LabelPtrPair<T>, bool> { bool operator()(const LabelPtrPair<T>& a, const LabelPtrPair<T>& b) const { return a.label < b.label; } }; #endif // TOOLS_GN_LABEL_PTR_H_