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-rw-r--r--src/FbTk/MemFun.hh56
-rw-r--r--src/FbTk/STLUtil.hh19
-rw-r--r--src/FbTk/SelectArg.hh74
-rw-r--r--src/tests/testSignals.cc33
4 files changed, 181 insertions, 1 deletions
diff --git a/src/FbTk/MemFun.hh b/src/FbTk/MemFun.hh
index 0425fc6..d265703 100644
--- a/src/FbTk/MemFun.hh
+++ b/src/FbTk/MemFun.hh
@@ -22,6 +22,8 @@
22#ifndef FBTK_MEM_FUN_HH 22#ifndef FBTK_MEM_FUN_HH
23#define FBTK_MEM_FUN_HH 23#define FBTK_MEM_FUN_HH
24 24
25#include "SelectArg.hh"
26
25namespace FbTk { 27namespace FbTk {
26 28
27/// No argument functor 29/// No argument functor
@@ -218,6 +220,60 @@ MemFunIgnoreArgs( Object& obj, ReturnType (Object:: *action)(Arg1,Arg2) ) {
218 return MemFun2IgnoreArgs<ReturnType, Object, Arg1, Arg2>(obj, action); 220 return MemFun2IgnoreArgs<ReturnType, Object, Arg1, Arg2>(obj, action);
219} 221}
220 222
223/**
224 * Creates a functor that selects a specific argument of three possible ones
225 * and uses it for the single argument operator.
226 */
227template < int ArgNum, typename Functor>
228class MemFunSelectArgImpl {
229public:
230
231 MemFunSelectArgImpl(Functor func):
232 m_func(func) {
233 }
234
235 template <typename Type1, typename Type2, typename Type3>
236 void operator ()(Type1 a, Type2 b, Type3 c) {
237 m_func(STLUtil::SelectArg<ArgNum>()(a, b, c));
238 }
239
240 template <typename Type1, typename Type2>
241 void operator ()(Type1 a, Type2 b) {
242 m_func(STLUtil::SelectArg<ArgNum>()(a, b));
243 }
244
245 template <typename Type1>
246 void operator ()(Type1 a) {
247 m_func(a);
248 }
249
250private:
251 Functor m_func;
252};
253
254/// Creates a functor that selects the first argument of three possible ones
255/// and uses it for the single argument operator.
256template <typename ReturnType, typename Object, typename Arg1>
257MemFunSelectArgImpl<0, MemFun1<ReturnType, Object, Arg1> >
258MemFunSelectArg0(Object& obj, ReturnType (Object:: *action)(Arg1)) {
259 return MemFunSelectArgImpl<0, MemFun1<ReturnType, Object, Arg1> >(MemFun(obj, action));
260}
261
262/// Creates a functor that selects the second argument (or first if there is
263/// only one) of three possible onesand uses it for the single argument operator.
264template <typename ReturnType, typename Object, typename Arg1>
265MemFunSelectArgImpl<1, MemFun1<ReturnType, Object, Arg1> >
266MemFunSelectArg1(Object& obj, ReturnType (Object:: *action)(Arg1)) {
267 return MemFunSelectArgImpl<1, MemFun1<ReturnType, Object, Arg1> >(MemFun(obj, action));
268}
269
270/// Creates a functor that selects the third argument (or the last argument if there is
271/// less than three arguments) of three possible onesand uses it for the single argument operator.
272template <typename ReturnType, typename Object, typename Arg1>
273MemFunSelectArgImpl<2, MemFun1<ReturnType, Object, Arg1> >
274MemFunSelectArg2(Object& obj, ReturnType (Object:: *action)(Arg1)) {
275 return MemFunSelectArgImpl<2, MemFun1<ReturnType, Object, Arg1> >(MemFun(obj, action));
276}
221 277
222} // namespace FbTk 278} // namespace FbTk
223 279
diff --git a/src/FbTk/STLUtil.hh b/src/FbTk/STLUtil.hh
index d427a17..e08036a 100644
--- a/src/FbTk/STLUtil.hh
+++ b/src/FbTk/STLUtil.hh
@@ -26,6 +26,25 @@
26namespace FbTk { 26namespace FbTk {
27namespace STLUtil { 27namespace STLUtil {
28 28
29template<bool C, typename Ta, typename Tb>
30struct IfThenElse;
31
32template<typename Ta, typename Tb>
33struct IfThenElse<true, Ta, Tb> {
34 Ta& operator ()(Ta& ta, Tb& tb) const {
35 return ta;
36 }
37 typedef Ta ResultType;
38};
39
40template<typename Ta, typename Tb>
41struct IfThenElse<false, Ta, Tb> {
42 Tb& operator ()(Ta& ta, Tb& tb) const {
43 return tb;
44 }
45 typedef Tb ResultType;
46};
47
29/// calls delete on each item in the container and then clears the container 48/// calls delete on each item in the container and then clears the container
30template <typename A> 49template <typename A>
31void destroyAndClear(A &a) { 50void destroyAndClear(A &a) {
diff --git a/src/FbTk/SelectArg.hh b/src/FbTk/SelectArg.hh
new file mode 100644
index 0000000..83626ad
--- /dev/null
+++ b/src/FbTk/SelectArg.hh
@@ -0,0 +1,74 @@
1// SelectArg.hh for FbTk
2// Copyright (c) 2010 Fluxbox Team (fluxgen at fluxbox dot org)
3//
4// Permission is hereby granted, free of charge, to any person obtaining a
5// copy of this software and associated documentation files (the "Software"),
6// to deal in the Software without restriction, including without limitation
7// the rights to use, copy, modify, merge, publish, distribute, sublicense,
8// and/or sell copies of the Software, and to permit persons to whom the
9// Software is furnished to do so, subject to the following conditions:
10//
11// The above copyright notice and this permission notice shall be included in
12// all copies or substantial portions of the Software.
13//
14// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
20// DEALINGS IN THE SOFTWARE.
21
22#ifndef FBTK_STLUTIL_SELECT_ARG_HH
23#define FBTK_STLUTIL_SELECT_ARG_HH
24
25#include "STLUtil.hh"
26
27namespace FbTk {
28
29namespace STLUtil {
30
31/**
32 * Selects a single argument from a maximum set of three arguments at compile time.
33 * For example:
34 * \begincode
35 * SelectArg<0>()( 10, 20, "hello" ); // returns first argument ( 10 )
36 * SelectArg<1>()( 10, "hello", 30 ); // returns second argument ( "hello" )
37 * SelectArg<2>()( 10, "hello", 30 ); // returns third argument ( 30 )
38 * \endcode
39 *
40 * The selection of argument 1 and 2 can return the last argument if the
41 * arguments are less or equal to two. For instance:
42 * \begincode
43 * SelectArg<1>()(10); // returns 10
44 * SelectArg<2>()(10, 20); // returns 20
45 * SelectArg<2>()(10); // returns 10
46 * \endcode
47 */
48template < int N >
49struct SelectArg {
50
51 template <typename Type1, typename Type2>
52 typename IfThenElse<N==0, Type1, Type2>::ResultType& operator ()(Type1& a, Type2& b){
53 return IfThenElse<N==0, Type1, Type2>()(a, b);
54 }
55
56 template <typename Type1, typename Type2, typename Type3>
57 typename IfThenElse<N==0, Type1,
58 typename IfThenElse<N==1, Type2, Type3>::ResultType>::ResultType&
59 operator () (Type1& a, Type2& b, Type3& c) {
60 return IfThenElse<N==0, Type1,
61 typename IfThenElse<N==1, Type2, Type3>::ResultType>()
62 (a, IfThenElse<N==1, Type2, Type3>() (b, c) );
63 }
64
65 template < typename Type1 >
66 Type1 operator() (Type1 a) {
67 return a;
68 }
69};
70
71} // end namespace STLUtil
72} // end namespace FbTk
73
74#endif // FBTK_STLUTIL_SELECT_ARG_HH
diff --git a/src/tests/testSignals.cc b/src/tests/testSignals.cc
index f382289..75f046e 100644
--- a/src/tests/testSignals.cc
+++ b/src/tests/testSignals.cc
@@ -49,7 +49,7 @@ struct FunctionClass {
49 } 49 }
50 50
51 void takeIt( string& str ) { 51 void takeIt( string& str ) {
52 cout << "takeIt( " << str << ")" << endl; 52 cout << "FunctionClass::takeIt( " << str << " )" << endl;
53 } 53 }
54 54
55 void showMessage( int value, const string& message ) { 55 void showMessage( int value, const string& message ) {
@@ -61,8 +61,21 @@ struct FunctionClass {
61 void threeArgs( int value, const string& str, double pi ) { 61 void threeArgs( int value, const string& str, double pi ) {
62 cout << "(" << value << "): " << str << ", pi = " << pi << endl; 62 cout << "(" << value << "): " << str << ", pi = " << pi << endl;
63 } 63 }
64
64}; 65};
65 66
67struct Printer {
68 void printInt(int value) {
69 cout << "Int:" << value << endl;
70 }
71 void printString(string value) {
72 cout << "string:" << value << endl;
73 }
74 void printFloat(float value) {
75 cout << "Float:" << value << endl;
76 }
77};
78
66int main() { 79int main() {
67 using FbTk::Signal; 80 using FbTk::Signal;
68 using FbTk::SignalTracker; 81 using FbTk::SignalTracker;
@@ -161,4 +174,22 @@ int main() {
161 // subject notify its observers 174 // subject notify its observers
162 source.emit("hello world"); 175 source.emit("hello world");
163 } 176 }
177
178 // Test argument selector
179 {
180 using namespace FbTk;
181 Signal<void, int, string, float> source;
182
183 Printer printer;
184 source.connect(MemFunSelectArg0(printer, &Printer::printInt));
185 source.connect(MemFunSelectArg1(printer, &Printer::printString));
186 source.connect(MemFunSelectArg2(printer, &Printer::printFloat));
187
188 source.emit(10, "hello", 3.141592);
189
190 Signal<void, string, int> source2;
191 source2.connect(MemFunSelectArg0(printer, &Printer::printString));
192 source2.connect(MemFunSelectArg1(printer, &Printer::printInt));
193 source2.emit("world", 37);
194 }
164} 195}