Ichthyostega
088e4422fb
Heureka! found out that the C++ standard library exposes a cross vendor C++ ABI, which amongst others allows to show object code names and type-IDs in the language-level, human readable unmangeld form. Of course, actual application code should not rely on such a internal representation, yet it is of tremendous help when writing and debugging unit tests. Signed-off-by: Ichthyostega <prg@ichthyostega.de>
99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
/* try.cpp - for trying out some language features....
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* scons will create the binary bin/try
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*
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*/
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// 8/07 - how to control NOBUG??
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// execute with NOBUG_LOG='ttt:TRACE' bin/try
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// 1/08 - working out a static initialisation problem for Visitor (Tag creation)
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// 1/08 - check 64bit longs
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// 4/08 - comparison operators on shared_ptr<Asset>
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// 4/08 - conversions on the value_type used for boost::any
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// 5/08 - how to guard a downcasting access, so it is compiled in only if the involved types are convertible
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// 7/08 - combining partial specialisation and subclasses
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// 10/8 - abusing the STL containers to hold noncopyable values
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// 6/09 - investigating how to build a mixin template providing an operator bool()
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// 12/9 - tracking down a strange "warning: type qualifiers ignored on function return type"
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// 1/10 - can we determine at compile time the presence of a certain function (for duck-typing)?
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// 4/10 - pretty printing STL containers with python enabled GDB?
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// 1/11 - exploring numeric limits
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// 1/11 - integer floor and wrap operation(s)
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// 1/11 - how to fetch the path of the own executable -- at least under Linux?
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// 10/11 - simple demo using a pointer and a struct
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// 11/11 - using the boost random number generator(s)
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// 12/11 - how to detect if string conversion is possible?
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// 1/12 - is partial application of member functions possible?
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// 5/14 - c++11 transition: detect empty function object
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// 7/14 - c++11 transition: std hash function vs. boost hash
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// 9/14 - variadic templates and perfect forwarding
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// 11/14 - pointer to member functions and name mangling
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/** @file try.cpp
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** Investigation: member function pointers, types and name mangling.
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**
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*/
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#include "lib/test/test-helper.hpp"
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#include "lib/util.hpp"
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#include <cstddef>
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#include <iostream>
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#include <string>
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using lib::test::showType;
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using lib::test::demangleCxx;
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using std::string;
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using std::cout;
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using std::endl;
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class Interface
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{
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public:
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virtual ~Interface() { } ///< this is an interface
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virtual string moo() =0;
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virtual string boo() =0;
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};
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class Impl
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: public Interface
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{
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string s_;
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string moo() { return s_ + " Moo"; }
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string boo() { return s_ + " Boo"; }
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public:
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Impl(string ss ="IMP")
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: s_(ss)
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{ }
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};
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int
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main (int, char**)
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{
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Impl obj;
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Interface& ref = obj;
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typedef string (Interface::*Memfun) (void);
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cout << "before call. Address... "<<&ref<<"\n";
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cout << ref.moo() << endl;
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cout << ref.boo() << endl;
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Memfun memfun = &Interface::moo;
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cout << demangleCxx (showType (memfun)) << endl;
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cout << demangleCxx (showType(&Interface::moo)) << endl;
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cout << (ref.*memfun) () << endl;
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cout << "\n.gulp.\n";
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return 0;
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}
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