stack top() returning -1.#IND,-1.#IND,-1.#IND in string

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C++

STL

Hello,

In a

stack<std::string>

I am doing a push() operation and stack contains data as below

[0]"-0585,-2857,-0059,00359,00360,00360,00100,02000,-0030,00360,00360,00360,00360,00360,00360,A%"
[1]"-0457,-2004,-0059,00359,00360,00360,00100,02000,-0030,00360,00360,00360,00360,00360,00360,B%"
[2]"-0477,-0358,-0059,00359,00360,00360,00100,02000,-0030,00360,00360,00360,00360,00360,00360,C%"
[3]"-0128,-1538,-0059,00359,00360,00360,00100,02000,-0030,00360,00360,00360,00360,00360,00360,D%"
[4]"-0155,-0378,-0059,00359,00360,00360,00100,02000,-0030,00360,00360,00360,00360,00360,00360,E%"

and so on 10000+.

Simultaneously I'm also performing a top() operation, which should return

"-0155,-0378,-0059,00359,00360,00360,00100,02000,-0030,00360,00360,00360,00360,00360,00360,E%"

but it returns the following as string format

"-1.#IND,-1.#IND,-1.#IND,00359,00360,00360,00100,02000,-0030,00360,00360,00360,00360,00360,00360,E%"

Moreover if i do check using

stack.top().size() != 0

,the top value changes and returns -1.#IND.....so on.

Why is the first 15 elements(excluding the ',') is changing to this nan values in a string?

//improved
I am using a boost client-server architecture(simple chat example).
Client1 ---posts data--> Server --publish data --> Client2(reads data in stack).
Client1 reads data from a COM port and posts the data.
Client2 pushes the received data to the stack.
The stack contents remains okay. But whenever i use the following code problem appears

boost::shared_lock<boost::shared_mutex> lock(_access);		
std::string mStr = "";
if(!stackstring.empty() && stackstring.top().size() != 0)
{
   mStr = stackstring.top();
   stackstring.pop();	
}

only the top value gets corrupted with -1.#IND..
so mStr gets wrong values. boost locks are used as read/write operation occurs simultaneously on the same stack variable.


Any help regarding this problem is appreciated.

Thanks and Regards,
Sayan.