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graph: Make perfect forwarding imperfect.

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Make sure the constructors with perfect forwarding for states and
transitions do not take the place of copy constructors.  Thanks to Akim
Demaille for its help.  This should fix a bug observed by Joachim Klein
and David Muller.

* src/graph/graph.hh: Disable forwarding constructors for states and
transitions if the first argument is a subclass of the current class.
This commit is contained in:
Alexandre Duret-Lutz 2015-02-06 13:55:25 +01:00
parent f2ba94f4d4
commit db34207084
1 changed files with 28 additions and 11 deletions
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39
src/graph/graph.hh
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@ -1,6 +1,6 @@
// -*- coding: utf-8 -*-
// Copyright (C) 2014 Laboratoire de Recherche et Développement de
// l'Epita.
// Copyright (C) 2014, 2015 Laboratoire de Recherche et Développement
// de l'Epita.
//
// This file is part of Spot, a model checking library.
//
@ -36,20 +36,35 @@ namespace spot
namespace internal
{
template <typename Of, typename ...Args>
struct first_is_base_of
{
static const bool value = false;
};
template <typename Of, typename Arg1, typename ...Args>
struct first_is_base_of<Of, Arg1, Args...>
{
static const bool value =
std::is_base_of<Of, typename std::decay<Arg1>::type>::value;
};
// The boxed_label class stores Data as an attribute called
// "label" if boxed is true. It is an empty class if Data is
// void, and it simply inherits from Data if boxed is false.
//
// The data() method offers an homogeneous access to the Data
// instance.
template <typename Data, bool boxed = !std::is_class<Data>::value>
struct SPOT_API boxed_label
{
typedef Data data_t;
Data label;
template <typename... Args>
template <typename... Args,
typename = typename std::enable_if<
!first_is_base_of<boxed_label, Args...>::value>::type>
boxed_label(Args&&... args):
label{std::forward<Args>(args)...}
{
@ -98,7 +113,9 @@ namespace spot
{
typedef Data data_t;
template <typename... Args>
template <typename... Args,
typename = typename std::enable_if<
!first_is_base_of<boxed_label, Args...>::value>::type>
boxed_label(Args&&... args):
Data{std::forward<Args>(args)...}
{
@ -131,15 +148,15 @@ namespace spot
template <typename Transition, typename State_Data>
struct SPOT_API distate_storage: public State_Data
{
Transition succ; // First outgoing transition (used when iterating)
Transition succ_tail; // Last outgoing transition (used for
Transition succ = 0; // First outgoing transition (used when iterating)
Transition succ_tail = 0; // Last outgoing transition (used for
// appending new transitions)
template <typename... Args>
template <typename... Args,
typename = typename std::enable_if<
!first_is_base_of<distate_storage, Args...>::value>::type>
distate_storage(Args&&... args):
State_Data{std::forward<Args>(args)...},
succ(0),
succ_tail(0)
State_Data{std::forward<Args>(args)...}
{
}
};