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To resolve this error, a first method that is helpful would be declaring the function prototype before the main() method. So, we have used the function prototype before the main method in the updated code. When we have compiled the code, it throws no exceptions and runs properly.
As from the name we can understand that when the compiler of Arduino IDE is unable to recognize any variable or is unable to process any loop or any instruction having any undeclared variable so it gives the error “not declared in this scope”, which means that code is unable to understand the instruction given in the ...
std::string class in C++ C++ has in its definition a way to represent a sequence of characters as an object of the class. This class is called std:: string. String class stores the characters as a sequence of bytes with the functionality of allowing access to the single-byte character.
The next method in this list to convert int to string in C++ is by using the to_string() function. This function is used to convert not only the integer but numerical values of any data type into a string. The to_string() method is included in the header file of the class string, i.e., <string> or <cstring>.
You have to use std::string since it's in the std namespace.
string is in the std namespace. You have the following options:
using namespace std; after the include and enable all the std names: then you can write only string on your program.using std::string after the include to enable std::string: then you can write only string on your program.std::string instead of string
I find that including:
using namespace std;
To your C++ code saves a lot of time in debugging especially in situations like yours where std:: string is required and also it will help in keeping your code clean.
With this in mind, your code should be:
#include <string>
using namespace std;
#include <boost/thread/tss.hpp>
static boost::thread_specific_ptr<string> _tssThreadNameSptr;
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