1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/* $Rev$ $Date$ */
#ifndef tuscany_function_hpp
#define tuscany_function_hpp
/**
* Lambda function type.
*/
#include <utility>
#include "fstream.hpp"
#include "gc.hpp"
#include "config.hpp"
namespace tuscany {
#ifdef WANT_MAINTAINER_COUNTERS
/**
* Debug counters.
*/
long int countProxies;
long int countFProxies = 0;
long int countCProxies = 0;
long int countLambdas = 0;
long int countELambdas = 0;
long int countCLambdas = 0;
long int countFLambdas = 0;
bool resetLambdaCounters() {
countLambdas = countELambdas = countCLambdas = countFLambdas = countProxies = countFProxies = countCProxies = 0;
return true;
}
bool checkLambdaCounters() {
return countLambdas == 0;
}
bool printLambdaCounters() {
cout << "countLambdas " << countLambdas << endl;
cout << "countELambdas " << countELambdas << endl;
cout << "countFLambdas " << countFLambdas << endl;
cout << "countCLambdas " << countCLambdas << endl;
cout << "countProxies " << countProxies << endl;
cout << "countFProxies " << countFProxies << endl;
cout << "countCProxies " << countCProxies << endl;
return true;
}
#else
#define resetLambdaCounters()
#define checkLambdaCounters() true
#define printLambdaCounters()
#endif
/**
* Lambda function type.
*/
template<typename R, typename... P> class Callable {
public:
Callable() {
}
virtual const size_t size() const = 0;
virtual const R operator()(P... p) const = 0;
virtual ~Callable() {
}
template<typename F> class Proxy: public Callable {
public:
Proxy(const F& f) : function(f) {
debug_inc(countProxies);
debug_inc(countFProxies);
}
Proxy(const Proxy& p) : function(p.function) {
debug_inc(countProxies);
debug_inc(countCProxies);
}
~Proxy() {
debug_dec(countProxies);
}
virtual const R operator() (P... p) const {
return function(std::forward<P>(p)...);
}
virtual const size_t size() const {
return sizeof(function);
}
private:
const F function;
};
};
template<typename S> class lambda;
template<typename R, typename... P> class lambda<R(P...)> {
public:
lambda() : callable(0) {
debug_inc(countLambdas);
debug_inc(countELambdas);
}
template<typename F> lambda(const F f) {
debug_inc(countLambdas);
debug_inc(countFLambdas);
typedef typename CallableType::template Proxy<F> ProxyType;
callable = gc_ptr<CallableType>(new (gc_new<ProxyType>()) ProxyType(f));
}
lambda(const lambda& l) {
debug_inc(countLambdas);
debug_inc(countCLambdas);
callable = l.callable;
}
const lambda& operator=(const lambda& l) {
if (this == &l)
return *this;
callable = l.callable;
return *this;
}
~lambda() {
debug_dec(countLambdas);
}
const bool operator==(const lambda& l) const {
if (this == &l)
return true;
return callable == l.callable;
}
const bool operator!=(const lambda& l) const {
return !this->operator==(l);
}
const R operator()(P... p) const {
return (*callable)(std::forward<P>(p)...);
}
template<typename S> friend ostream& operator<<(ostream&, const lambda<S>&);
template<typename S> friend const bool isNil(const lambda<S>& l);
private:
typedef Callable<R,P...> CallableType;
gc_ptr<CallableType> callable;
};
template<typename S> ostream& operator<<(ostream& out, const lambda<S>& l) {
return out << "lambda::" << l.callable;
}
/**
* Return true if a lambda is nil.
*/
template<typename S> const bool isNil(const lambda<S>& l) {
return ((void*)l.callable) == 0;
}
/**
* Curry a lambda function.
*/
template<typename R, typename T, typename... P> class curried {
public:
curried(const lambda<R(T, P...)>& f, const T& v): v(v), f(f) {
}
const R operator()(P... p) const {
return f(v, std::forward<P>(p)...);
}
private:
const T v;
const lambda<R(T, P...)>f;
};
template<typename R, typename T, typename... P> const lambda<R(P...)> curry(const lambda<R(T, P...)>& f, const T& t) {
return curried<R, T, P...>(f, t);
}
template<typename R, typename T, typename U, typename... P> const lambda<R(P...)> curry(const lambda<R(T, U, P...)>& f, const T& t, const U& u) {
return curry(curry(f, t), u);
}
template<typename R, typename T, typename U, typename V, typename... P> const lambda<R(P...)> curry(const lambda<R(T, U, V, P...)>& f, const T& t, const U& u, const V& v) {
return curry(curry(curry(f, t), u), v);
}
/**
* A lambda function that returns the given value.
*/
template<typename T> class returnResult {
public:
returnResult(const T& v) :
v(v) {
}
const T operator()() const {
return v;
}
private:
const T v;
};
template<typename T> const lambda<T()> result(const T& v) {
return returnResult<T> (v);
}
}
#endif /* tuscany_function_hpp */
|
