Re: problem with function calling tracker

From:

Frank Bergemann <FBergemann@web.de>

Newsgroups:

comp.lang.c++.moderated

Date:

Fri, 4 Nov 2011 16:39:31 -0700 (PDT)

Message-ID:

<63b022c1-f6dd-4ee5-bed0-20ce54f0bb49@hv4g2000vbb.googlegroups.com>

It works (somehow).
But i have still a problem.
I can't disable copy c'tor for class ArgCommon and the classes derived
from it
(prepared but disabled in code below).
However, actually the object to track (function argument) is not
copied - already know.
So it might not be needed to disable copy c'tor for ArgCommon and
derived classes(?!)

Can you help me, please?
- many thanks!

Here is the latest version
(For you convenience, you can download tgz with Makefile from here:
http://frank-bergemann.jimdo.com/programming/c/functiontracker/
at the bottom of the page)

----------------------------------- FunctionTracker.h
------------------------------------
/*
* FunctionTracker.h
*
* Created on: Oct 30, 2011
* Author: frank
*/

#ifndef __FUNCTION_TRACKER_H__
#define __FUNCTION_TRACKER_H__

#include <iostream>
#include <iomanip>
#include <utility> // std::forward<>
#include <tr1/tuple> // std::tr1::tuple<>

/*
* TODO:
* +) use namespace
* +) hide internal definitions from user
* +) do w/o FunctionTracker.cpp
* +) don't directly log to std::cerr
* option: static FunctionTracker::Setup to pass stream? (functor?)
*/

/**
* function parameter type (in, out, inout)
*/
typedef enum
{
 In_c = 1,
 Out_c = 2,
 InOut_c = In_c | Out_c
} ParamType_t;

/**
* non-template base class for function parameters
*/
struct ArgCommon
{
 char const * const _name;
 ParamType_t const _type;
 ArgCommon(
 char const * const name,
 ParamType_t const type)
 : _name(name),
 _type(type)
 { };

// ArgCommon(const ArgCommon & rhs) = delete;
};

/**
* template'd function parameter class
* extending ArgCommon
*/
template <typename T>
struct Arg : public ArgCommon
{
 T const & _value;

 Arg(
 char const * const name,
 ParamType_t const type,
 T const & value)
 : ArgCommon(name, type),
 _value(value)
 { };

// Arg(const Arg & rhs) = delete;
};

/*
* Abbreviations for IN, OUT & INOUT parameter
*/

/**
* IN parameter
*/
template <typename T>
struct InArg : public Arg<T>
{
 InArg(
 char const * const name,
 T const & value)
 : Arg<T>(name, In_c, value)
 { };

// InArg(const InArg & rhs) = delete;
};

/**
* OUT parameter
*/
template <typename T>
struct OutArg : public Arg<T>
{
 OutArg(
 char const * const name,
 T const & value)
 : Arg<T>(name, Out_c, value)
 { };

// OutArg(const OutArg & rhs) = delete;
};

/**
* INOUT parameter
*/
template <typename T>
struct InOutArg : public Arg<T>
{
 InOutArg(
 char const * const name,
 T const & value)
 : Arg<T>(name, InOut_c, value)
 { };

 InOutArg(const InOutArg & rhs) = delete;
};

// variadic template type list transformation
template <typename ...Types>
struct ArgTuple
{
 /*
 * TODO: this implies copying of the args!
 * But the version to use references doesn't work!
 */
#if 0
 typedef typename std::tr1::tuple<const Arg<Types>&...> Type;
#endif
 typedef typename std::tr1::tuple<const Arg<Types>...> Type;

 ArgTuple(const ArgTuple & rhs) = delete;
};

/**
* ostream helper for function paramter
* supposes ostream helper for the parameter type is avail
*/
template <typename T>
std::ostream &operator<<(
 std::ostream &out,
 const Arg<T> &arg)
{
 out << arg._name << " => '" << arg._value << "'";
 return out;
}

struct FunctionTrackerShared {
 static int _level;
};

template <typename ParamTuple>
class FunctionTrackerImpl
{
 private:
 char const * const _funcName;

 /*
 * TODO:
 * This implies copying
 * Try to do with const reference (rvalue reference?)
 * But the version to use references doesn't work!
 */
#if 0
 const ParamTuple & _params;
#endif
 const ParamTuple _params;

 protected:
 FunctionTrackerImpl(
 char const* const funcName,
 ParamTuple && params)
 : _funcName(funcName?funcName:"<unknown>"),
 _params(std::forward<ParamTuple>(params))
 {
 if (FunctionTrackerShared::_level > 0) {
 std::cerr << std::setw(FunctionTrackerShared::_level) << ' ';
 }
 std::cerr << _funcName << ": enter with ";
 PrintInput(_params);
 std::cerr << std::endl;
 ++FunctionTrackerShared::_level;
 }

 FunctionTrackerImpl(const FunctionTrackerImpl & rhs)
 : _funcName(rhs._funcName),
 _params(rhs._params)
 {
 std::cerr << "!!! _EnterExitMsgImpl copy c'tor !!!" << std::endl;
 }

 ~FunctionTrackerImpl()
 {
 --FunctionTrackerShared::_level;
 if (FunctionTrackerShared::_level > 0) {
 std::cerr << std::setw(FunctionTrackerShared::_level) << ' ';
 }
 std::cerr << _funcName << ": exit with ";
 PrintOutput(_params);
 std::cerr << std::endl;
 }

 void PrintInput(
 const ParamTuple & params)
 {
 std::cerr << "input: ";
 PrintTuple(In_c, params);
 }

 void PrintOutput(
 const ParamTuple & params)
 {
 std::cerr << "output: ";
 PrintTuple(Out_c, params);
 }

 template<std::size_t I = 0, typename... Tp>
 inline typename std::enable_if::type
 PrintTuple(ParamType_t const paramType, const
std::tr1::tuple<Tp...>& t)
 { }

 template<std::size_t I = 0, typename... Tp>
 inline typename std::enable_if::type
 PrintTuple(ParamType_t const paramType, const
std::tr1::tuple<Tp...>& t)
 {
 ArgCommon arg = std::tr1::get(t);
 if (paramType == arg._type) {
 std::cerr << std::tr1::get(t) << ", ";
 }
 PrintTuple(paramType, t);
 }

};

template <typename... Types>
class FunctionTracker : public FunctionTrackerImpl< typename
ArgTuple<Types...>::Type >
{
private:
 typedef FunctionTrackerImpl< typename ArgTuple<Types...>::Type >
BaseType;

 typedef typename ArgTuple<Types...>::Type ParamTuple;

 FunctionTracker(
 char const * const funcName,
 ParamTuple && params)
 : FunctionTrackerImpl<ParamTuple>(funcName,
std::forward<ParamTuple>(params))
 { };

public:
 FunctionTracker(const FunctionTracker & rhs)
 : BaseType(rhs)
 { };

 template <typename... Args>
 static FunctionTracker make(
 char const * const funcName,
 Args&&... args)
 {
 return FunctionTracker<Types...>(funcName,
std::tr1::make_tuple(std::forward<Args>(args)...));
 };
};

#endif /*__FUNCTION_TRACKER_H__*/

-----------------------------------------------------------------------------------------------
--------------------------------- FunctionTracker.cpp
-----------------------------------------
/*
* FunctionTracker.cpp
*
* Created on: Nov 1, 2011
* Author: frank
*/

#include "FunctionTracker.h"

int FunctionTrackerShared::_level = 0;
-----------------------------------------------------------------------------------------------
--------------------------------- FunctionTrackerTest.cpp
-------------------------------------
/*
* FunctionTrackerTest.cpp
*
* Created on: Oct 30, 2011
* Author: frank
*/

#include <iostream>
#include <stdexcept>

#include "FunctionTracker.h"

#define DEBUG

/*
* a test class to check, if EnterExitMsg
* does unwanted copying or given arguments
*/
class TestClass
{
public:
 TestClass()
 {};

 ~TestClass()
 {};

 TestClass(
 const TestClass & rhs)
 {
 std::cerr << "!!! TestClass copy c'tor invoked !!!" << std::endl;
 };
};

std::ostream &
operator<<(
 std::ostream & out,
 const TestClass & arg)
{
 out << "TestClass";
 return out;
}

int
ForthLevelProcedure(
 char const * const inp)
{
 int retVal = 4711;
 bool normalExit = false;
#ifdef DEBUG
 auto enterExitMsg = FunctionTracker<char const * const, int,
bool>::make(
 __FUNCTION__,
 InArg<char const * const>("inp", inp),
 OutArg<int>("retVal", retVal),
 OutArg<bool>("normalExit", normalExit)
 );
#endif

 throw std::runtime_error("hello");
 normalExit = true;
 return retVal;
}

int
ThirdLevelProcedure(
 int const & inp1,
 char const * const inp2,
 const TestClass & tc1,
 const TestClass & tc2)
{
 int retVal = 3;
 bool normalExit = 0;

#ifdef DEBUG
 auto enterExitMsg = FunctionTracker<int, char const * const,
TestClass, TestClass, int, bool>::make(
 __FUNCTION__,
 std::forward<InArg<int>>(InArg<int>("inp1", inp1)),
 std::forward<InArg<char const * const>>(InArg<char const *
const>("inp2", inp2)),
 std::forward<InArg<TestClass>>(InArg<TestClass>("tc1", tc1)),
 std::forward<InArg<TestClass>>(InArg<TestClass>("tc2", tc2)),
 std::forward<OutArg<int>>(OutArg<int>("retVal", retVal)),
 std::forward<OutArg<bool>>(OutArg<bool>("normalExit", normalExit)));
#endif

 std::cerr << "\thello, from ThirdLevelProcedure()" << std::endl;

 // check for throwing function called
 try {
 ForthLevelProcedure("calling ForthLevelProcedure()");
 }
 catch(...) {
 std::cerr << "!!! caught exception from
ForthLevelProcedure(...) !!!" << std::endl;
 }

 normalExit = true;
 return retVal;
}

int
SecondLevelProcedure(
 void)
{
 int retVal = 2;

#ifdef DEBUG
 auto enterExitMsg = FunctionTracker<int>::make(
 __FUNCTION__,
 std::forward<OutArg<int>>(OutArg<int>("retVal", retVal)));
#endif

 std::cerr << "\thello, from SecondLevelProcedure()" << std::endl;

 TestClass tc;
 ThirdLevelProcedure(5, "calling ThirdLevelProcedure()", tc,
TestClass());

 return retVal;
}

int
FirstLevelProcedure(
 char const * const inp1)
{
 int retVal = 1;

#ifdef DEBUG
 auto functionTracker = FunctionTracker<char const * const,
int>::make(
 __FUNCTION__,
 std::forward<InArg<char const * const>>(InArg<char const *
const>("inp1", inp1)),
 std::forward<OutArg<int>>(OutArg<int>("retVal", retVal)));
#endif

 std::cerr << "\thello, from FirstLevelProcedure()" << std::endl;

 SecondLevelProcedure();

 return retVal;
}

int
main(
 int argc,
 char ** argv)
{
 FirstLevelProcedure("calling FirstLevelProcedure()");
#if 0
 std::cerr << std::endl;

 SecondLevelProcedure();
#endif
 return 0;
}
-----------------------------------------------------------------------------------------------

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