// 1 filename:cpp2011-14-5-4.cpp
// ver 0.1 June.15, 2014
//
// 2 original examples and/or notes:
// (c) ISO/IEC JTC1 SC22 WG21 N3242, April 12, 2011
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3242.pdf
// >14 Templates 14.5 Template declarations 14.5.4 Friends
// (c) Dr. OGAWA Kiyoshi, kaizen at gifu-u.ac.jp,
//
// 4 compile errors and/or warnings:
// 4.1(c) Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
// Target: x86_64-apple-darwin13.2.0,  Thread model: posix
// Command/Options: c++ -std=c++11 -stdlib=libc++ -Wall cpp2011-14-5-4.cpp 
// (c) LLVM 2003-2009 University of Illinois at Urbana-Champaign.

// 4.2. g++-4.9 (GCC) 4.9.0 20131229 (experimental)
// Copyright (C) 2013 Free Software Foundation, Inc.
// This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// http://gcc.gnu.org/onlinedocs/gcc/Standards.html
// Command/Options: g++-4.9  -std=c++11  -Wall cpp2011-14-5-4.cpp 
// g++-4.9: error: unrecognized command line option '-stdlib=libc++'
// Configuration:brew install gcc49
//
// 4.3. Visual Studio Express 2013, 
// (c) Microsoft http://www.visualstudio.com/
// SPEC:
// Windows 7, .NET Framework
// (c) VMware, Inc.
// VMWare fusion 6
//
// 5. Hardware:  MacBook Pro, 
//(c) Intel http://ark.intel.com/products/37006/
//Core 2 Duo 2.53GHz, 8GB, 1067MHz DDR3
//
// 6. Special Thanks: Upper organizatios and 
// ITSCJ/IPSJ http://www.itscj.ipsj.or.jp/itscj_english/index.html
// Renesas Electronics Corporation.http://www.renesas.com/
// NPO SESSAME project, http://www.sessame.jp/workinggroup/WorkingGroup3/
// Toyo Corporation, http://www.toyo.co.jp/English/
// Japan Standard Association, http://bit.ly/1lzykg1
// NPO TOPPERS project, https://www.toppers.jp/asp-d-download.html
// Daido Universcity, http://www.daido-it.ac.jp/gakubugakka/computer/index.html
// WITZ Co.Ltd., http://www.witz-inc.co.jp/products/solution/solution.html
// SevenWise.co., http://www.7ws.co.jp/index.html
// TOYOTA Motor Corporation, http://toyota.jp/
// IT planning Inc., http://www.itpl.co.jp/en/index.html
// DENSO Corporation, http://www.globaldenso.com/en/
// Aisin Seiki co. Ltd., http://www.aisin.com/
// Spancion Inc., http://www.spansion.com/
// Yazaki Corporation, http://www.yazaki-group.com/global/
// Pananosic Corporation, http://www.panasonic.net/
// SWEST: Summer Workshop on Embedded System Technologies , http://swest.toppers.jp
// CEST: Consortium for Embedded System Technology, http://www.ertl.jp/CEST/
// JUSE: Union of Japanese Scientists and Engineers, http://www.juse.or.jp/e/
// OSC:Open Source Conference, http://www.ospn.jp/

#include <iostream>
//#include <cstdlib>
//#include <string.h>
//#include <cstring>
//#include <type_traits>
//#include <cassert>
//#include <algorithm>
//#include <cmath>
//#include <complex>
//#include <ccomplex>
//#include <cstddef>
//#include <new>
//#include <vector>
//#include <valarray>

using namespace std;


template<class T> class task;
template<class T> task<T>* preempt(task<T>*);
template<class T> class task {
friend void next_time();
friend void process(task<T>*);
friend task<T>* preempt<T>(task<T>*);
template<class C> friend int func(C);
friend class task<int>;
template<class P> friend class frd;
};
//
class A {
template<class T> friend class B; // OK
template<class T> friend void f(T){ /* ... */ } // OK
};
//
class X {
template<class T> friend struct A2;
class Y { };
};
template<class T> struct A2 { X::Y ab; }; // OK
template<class T> struct A2<T*> { X::Y ab; }; // OK
//

template<class T> struct A3 {
struct B { };
void f();
struct D {
void g();
};
};
template<> struct A3<int> {
struct B { };
int f();
struct D {
void g();
};
};
class C {
template<class T> friend struct A3<T>::B; // grants friendship to A<int>::B even though
// it is not a specialization of A<T>::B
template<class T> friend void A3<T>::f(); // does not grant friendship to A<int>::f()
// because its return type does not match
template<class T> friend void A3<T>::D::g(); // does not grant friendship to A<int>::D::g()
// because A<int>::D is not a specialization of A<T>::D
};
//
template<class T> class A4 { };
class X2 {
//error: template<class T> friend class A4<T*>; // error: partial specialization cannot be declared as a friend
};

int main() {

	cout << "14 Templates 14.5 Template declarations 14.5.4 Friends" << std::endl;
	return 0;
}
// 1 output
// 14 Templates 14.5 Template declarations 14.5.4 Friends