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/*
* 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_MODE
/**
* 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 */
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