/usr/include/t3/widget/t3widget/signals.h is in libt3widget-dev 0.6.2-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | /* Copyright (C) 2015,2018 G.P. Halkes
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License version 3, as
published by the Free Software Foundation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef T3_WIDGET_SIGNAL_H
#define T3_WIDGET_SIGNAL_H
// This define is retained, even though it is now permanently set to 1, to
// maintain the API.
#define _T3WIDGET_CXX11SIGNALS 1
#include <functional>
#include <list>
#include <memory>
#include <t3widget/widget_api.h>
// Reimplementation of the basic libsigc++ functionality using std::function.
// This requires C++11 support, but then so does libsigc++ version 2.5.1 and
// greater.
namespace t3_widget {
namespace signals {
namespace internal {
template <typename C>
struct identity {
typedef C type;
};
} // namespace internal
// mem_fun
template <typename R, typename C, typename... Args>
std::function<R(Args...)> mem_fun(typename internal::identity<C>::type *instance,
R (C::*func)(Args...)) {
return [=](Args... args) { return (instance->*func)(args...); };
}
template <typename R, typename C, typename... Args>
std::function<R(Args...)> mem_fun(typename internal::identity<C>::type *instance,
R (C::*func)(Args...) const) {
return [=](Args... args) { return (instance->*func)(args...); };
}
// Extra templates for disambiguation.
template <typename R, typename C>
std::function<R()> mem_fun0(typename internal::identity<C>::type *instance, R (C::*func)()) {
return [=]() { return (instance->*func)(); };
}
template <typename R, typename C, typename A>
std::function<R(A)> mem_fun1(typename internal::identity<C>::type *instance, R (C::*func)(A)) {
return [=](A a) { return (instance->*func)(a); };
}
// ptr_fun
template <typename R, typename... Args>
std::function<R(Args...)> ptr_fun(R (*ptr)(Args...)) {
return ptr;
}
// bind. Because the bind template from sigc binds from the rear, we can't use the much nicer trick
// with variable number of arguments. So here we provide all the overloads that we actually use in
// the library.
template <typename R, typename A>
std::function<R()> bind(std::function<R(A)> f, typename internal::identity<A>::type a) {
return [=]() { return f(a); };
}
template <typename R, typename A, typename B>
std::function<R(A)> bind(std::function<R(A, B)> f, typename internal::identity<B>::type b) {
return [=](A a) { return f(a, b); };
}
template <typename R, typename A, typename B, typename C>
std::function<R(A, B)> bind(std::function<R(A, B, C)> f, typename internal::identity<C>::type c) {
return [=](A a, B b) { return f(a, b, c); };
}
template <typename R, typename A, typename B, typename C, typename D>
std::function<R(A, B)> bind(std::function<R(A, B, C, D)> f, typename internal::identity<C>::type c,
typename internal::identity<D>::type d) {
return [=](A a, B b) { return f(a, b, c, d); };
}
// slot
template <typename R, typename... Args>
using slot = std::function<R(Args...)>;
namespace internal {
class func_ptr_base {
public:
virtual ~func_ptr_base() = default;
virtual void disconnect() = 0;
virtual bool is_valid() = 0;
bool is_blocked() { return blocked; }
void block() { blocked = true; }
void unblock() { blocked = true; }
private:
bool blocked = false;
};
template <typename R, typename... Args>
class func_ptr : public func_ptr_base {
public:
using F = std::function<R(Args...)>;
func_ptr(F f) : func(new F(f)) {}
void disconnect() override { func.reset(); }
bool is_valid() override { return !!func; }
R call(Args... args) { return (*func)(args...); }
private:
std::unique_ptr<F> func;
};
} // namespace internal
class T3_WIDGET_API connection {
public:
connection() = default;
connection(std::shared_ptr<internal::func_ptr_base> f) : func(f) {}
connection(const connection &other) : func(other.func) {}
void disconnect() {
if (func) func->disconnect();
}
void block() {
if (func) func->block();
}
void unblock() {
if (func) func->unblock();
}
private:
std::shared_ptr<internal::func_ptr_base> func;
};
template <typename R, typename... Args>
class T3_WIDGET_API signal {
public:
connection connect(std::function<R(Args...)> func) {
funcs.emplace_back(new internal::func_ptr<R, Args...>(func));
return connection(funcs.back());
}
R operator()(Args... args) {
auto iter = funcs.begin();
auto last_valid = funcs.end();
// Remove functions that no longer exist.
while (iter != funcs.end()) {
if (!(*iter)->is_valid()) {
iter = funcs.erase(iter);
} else if ((*iter)->is_blocked()) {
++iter;
} else {
last_valid = iter;
++iter;
}
}
for (iter = funcs.begin(); iter != last_valid; ++iter)
static_cast<internal::func_ptr<R, Args...> *>(iter->get())->call(args...);
if (iter == funcs.end()) return R();
return static_cast<internal::func_ptr<R, Args...> *>(last_valid->get())->call(args...);
}
slot<R, Args...> make_slot() {
return [this](Args... args) { return (*this)(args...); };
}
private:
std::list<std::shared_ptr<internal::func_ptr_base>> funcs;
};
} // namesapce signals
} // namesapce t3_widget
#endif
|