How to use vectors to set attributes¶
Intended audience: developers, Programming language: c++
This page contains examples on how to use C++ vectors to set attribute values on the servers side.
Warning
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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | 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());
}
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | 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());
}
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