CPP: How to use C++ vectors to set Tango attribute values

This page contains examples on how to use C++ vectors to set attribute values on the servers side.

ATTENTION:

Tango is optimized not to copy data. For this reason all the attribute set_value() methods only take pointers as input. If you are going to use C++ vectors, you should be aware of the fact that you are going to copy the data! This might slow down execution time when working with large amount of data.

Examples for a vector of short and a vector of string:

void MyClass::read_Spectrum(Tango::Attribute &attr)
{
	DEBUG_STREAM << "MyClass::read_Spectrum() entering... "<< endl;
	
	vector<Tango::DevShort> val;
	val.push_back(1);
	val.push_back(2);
	val.push_back(3);

	// data copy !!
	Tango::DevVarShortArray tmp_seq;
	tmp_seq << val;
	
	attr.set_value (tmp_seq.get_buffer(), tmp_seq.length());
}

void MyClass::read_StringSpectrum(Tango::Attribute &attr)
{
	DEBUG_STREAM << "MyClass::read_StringSpectrum() entering... "<< endl;

	vector<string> val;
	val.push_back("Hello");
	val.push_back("cruel");
	val.push_back("world!");

	// data copy !!
	Tango::DevVarStringArray tmp_seq;
	tmp_seq << val;

	attr.set_value (tmp_seq.get_buffer(), tmp_seq.length());
}