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Home » Community » Newbie corner » Value strange behaviour result in ValueTypeError
Value strange behaviour result in ValueTypeError [message #51791] Fri, 31 May 2019 01:44 Go to next message
Xemuth is currently offline  Xemuth
Messages: 310
Registered: August 2018
Location: France
Senior Member
Hello Community,

look at this code :
#include <Core/Core.h>
using namespace Upp;

VectorMap<String,Value> ConfigurationType;

template <class T> bool testAddVector(String keyname, const T &t){
	if(ConfigurationType.Add(keyname,Value(t))) //Add t to value
		return true;
}

CONSOLE_APP_MAIN
{
	String theString = "Hello world";
	ConfigurationType.Add("test1",Value(theString)); //simply add value to vector
	Cout() << (String)ConfigurationType[0].Get<String>()<<"\n"; //Show the result from casting back the value to String
	testAddVector<String>("test2", theString); // add value from a function (Crash on it)
	//It result on Upp::ValueTypeError exception
	Cout() << (String)ConfigurationType[1].Get<String>()<<"\n"; //Code stop Before this point
}	


It result on a crash i don't get why.
Can someone explain me ?
I have put test case file below.

Thanks in advance,

Best regard.


Re: Value strange behaviour result in ValueTypeError [message #51796 is a reply to message #51791] Fri, 31 May 2019 23:30 Go to previous messageGo to next message
Novo is currently offline  Novo
Messages: 1140
Registered: December 2006
Senior Contributor
Your code is throwing an exception.
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007ffff7a42535 in __GI_abort () at abort.c:79
#2  0x00007ffff7e0b642 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#3  0x00007ffff7e17186 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#4  0x00007ffff7e171d1 in std::terminate() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#5  0x00007ffff7e17405 in __cxa_throw () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#6  0x00005555556109c4 in Upp::Value::GetSmall<long long> (this=0x7ffff7fc85b0) at /home/ssg/dvlp/cpp/upp/git/uppsrc/Core/Value.hpp:209
#7  0x00005555555ae241 in Upp::Value::GetOtherBool (this=0x7ffff7fc85b0) at /home/ssg/dvlp/cpp/upp/git/uppsrc/Core/Value.cpp:203
#8  0x000055555556ca7e in Upp::Value::operator bool (this=0x7ffff7fc85b0) at /home/ssg/dvlp/cpp/upp/git/uppsrc/Core/Value.h:221
#9  0x000055555556d1ed in testAddVector<Upp::String> (keyname=..., t=...)
    at /home/ssg/dvlp/cpp/sergey/upp/ValueStrangeBehaviour/ValueStrangeBehaviour.cpp:7
#10 0x000055555556be96 in ConsoleMainFn_ () at /home/ssg/dvlp/cpp/sergey/upp/ValueStrangeBehaviour/ValueStrangeBehaviour.cpp:17
#11 0x000055555558d2dd in Upp::AppExecute__ (app=0x55555556bc76 <ConsoleMainFn_()>) at /home/ssg/dvlp/cpp/upp/git/uppsrc/Core/App.cpp:343
#12 0x000055555556bc69 in main (argc=1, argv=0x7fffffffdf18, envptr=0x7fffffffdf28)
    at /home/ssg/dvlp/cpp/sergey/upp/ValueStrangeBehaviour/ValueStrangeBehaviour.cpp:12


This is happening in this statement:
if(ConfigurationType.Add()) //Add t to value

because you are adding a String, which will be returned by the method Add(), and you are trying to implicitly convert Value, containing this string, to bool in the if() statement.
Such conversion is impossible. This is why you are getting an exception.


Regards,
Novo
Re: Value strange behaviour result in ValueTypeError [message #51797 is a reply to message #51791] Sat, 01 June 2019 11:32 Go to previous messageGo to next message
Oblivion is currently offline  Oblivion
Messages: 828
Registered: August 2007
Experienced Contributor
Hello Xemuth,

Novo is right.

You are implicitly trying to convert a string "Value" to bool, which is not possible that way.

VectorMap<String, String> ConfigurationType;

template <class T>
bool testAddVector(String keyname, const T& t)
{
	ConfigurationType.Add(keyname, t); // You have implicitly tried to convert a string "Value" into a bool "Value" (hence the "Value" error)
	return true;
}

ValueMap vmap;

void TestValueMap(Value key, Value val) // Just change the key's signature to String if you want to limit the key type...
{
	vmap.Add(key, val);
}

CONSOLE_APP_MAIN
{
		StdLogSetup(LOG_COUT|LOG_FILE);
		
		String s = "world";
		testAddVector("Hello", s);
		DUMP(ConfigurationType.ToString());
		
		// If possible, I suggest using a ValueMap.
		
		TestValueMap("Hello", "World");
		TestValueMap(1, "This is a test");
		TestValueMap("This is a test too!", 2);
		
		DUMP(vmap);
}



Best regards,
Oblivion


[Updated on: Sat, 01 June 2019 11:36]

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Re: Value strange behaviour result in ValueTypeError [message #51798 is a reply to message #51791] Sat, 01 June 2019 14:03 Go to previous message
Xemuth is currently offline  Xemuth
Messages: 310
Registered: August 2018
Location: France
Senior Member
Hello Novo && Oblivion,

Yes indeed by removing the if statement my problem gone.

I though by putting object on if, c++ would compare address of this object to nullpointer.

anyway problem fixed, thanks guys for your help !

Have good day !


[Updated on: Sun, 02 June 2019 16:42]

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