八度值列表数据类型

Question

I'm using Octave in cpp code. I call Octave functions using feval. The code is-

octave_value_list out = feval (pstData[0], in, 1);

Which function do I have to use to determine the data type and size of each element in the list out ? I have to check if the element is scalar/2D matrix/hypermatrix, the data type- complex/real/int/float/double/bool/string and the size of the matrix.

Answer 1

From the doc of octave_value_list , I'd say you can access its elements through the operator() . This way, you will get an octave_value , a type that offers all the functions you need , like is_float_type() , is_double_type() , etc..

Example (not tested)

octave_value& v = out(2); // access the value with id 2
bool is_double = v.is_double_type; // check wether out(2) is a double