80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
// -*- c++ -*-
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/* Copyright 2002, The libsigc++ Development Team
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* Assigned to public domain. Use as you wish without restriction.
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*/
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#include "testutilities.h"
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#include <sigc++/adaptors/bind_return.h>
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#include <sigc++/functors/slot.h>
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#include <sstream>
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#include <string>
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#include <cstdlib>
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namespace
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{
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std::ostringstream result_stream;
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struct foo
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{
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void operator()(int i)
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{
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result_stream << "foo(int " << i << ") ";
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}
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float operator()(float i)
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{
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result_stream << "foo(float " << i << ") ";
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return i*5;
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}
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};
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struct bar : public sigc::trackable
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{
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bar(int i = 0) : i_(i) {}
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operator int() { return i_; }
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int i_;
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};
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} // end anonymous namespace
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int main(int argc, char* argv[])
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{
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auto util = TestUtilities::get_instance();
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if (!util->check_command_args(argc, argv))
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return util->get_result_and_delete_instance() ? EXIT_SUCCESS : EXIT_FAILURE;
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result_stream << sigc::bind_return(foo(), -12345)(5);
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util->check_result(result_stream, "foo(int 5) -12345");
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// Here we just build a functor, not a slot. There is no such thing as a
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// default functor, or an invalidated functor. As such, functors can return
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// references.
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std::string str("guest book");
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// A convoluted way to do
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// sigc::bind_return(foo(), std::ref(str))(6) = "main";
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sigc::bind_return<std::reference_wrapper<std::string> >(foo(), std::ref(str))(6) = "main";
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result_stream << str;
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util->check_result(result_stream, "foo(int 6) main");
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// Here we build a slot (constructed from a functor). Slots cannot return
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// references: if they could, then what would be the return value of the
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// default slot or of an invalidated slot? On the other hand, slots are
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// guaranteed to be able to construct and return a valid default instance as
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// long as there exists a default constructor for it.
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//
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// Therefore, we use 'bar', and not 'bar&' for this slot signature.
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sigc::slot<bar, int> sl;
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{
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bar choco(-1);
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sl = sigc::bind_return(foo(),std::ref(choco));
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result_stream << sl(7);
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util->check_result(result_stream, "foo(int 7) -1");
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} // auto-disconnect
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result_stream << sl(8);
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util->check_result(result_stream, "0");
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return util->get_result_and_delete_instance() ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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