C++时间库和八度.oct文件

Question

我正在尝试编写一个使用 linasm-1.13 库的 Octave C++ .oct 函数，但我似乎甚至无法从/usr/share/zoneinfo/获得 tzdata 的基本加载来工作。到目前为止，我的简单测试函数是

#include <octave/oct.h>
#include <Time.h> // the linasm-1.13 library
DEFUN_DLD ( tz, args, nargout,
"-*- texinfo -*-n
@deftypefn {Function File} {} tz (@var{YYYYMMDDHHMMSS})n
n
@end deftypefn" )
{
octave_value_list retval_list ;
unsigned int tz ;
const char *ny_time = "/usr/share/zoneinfo/America/New_York" ; 
tz = Time::LoadTimeZone( ny_time ) ;
return retval_list ;

在使用 mkoctfile 编译时，会给出此错误

>> mkoctfile tz.cc
tz.cc: In function ‘octave_value_list Ftz(const octave_value_list&, int)’:
tz.cc:24:34: error: cannot call member function ‘unsigned int  Time::LoadTimeZone(const char*)’ without object
tz = Time::LoadTimeZone( ny_time ) ;
                              ^
warning: mkoctfile: building exited with failure status

我对此的理解是，ny_time不是一个被识别的对象，但我尝试ny_time转换为字符串文字，如这个公认的 SO 答案中所述。

我这样做是因为根据linasm页面，LoadTimeZone的输入应该是"tzfile的路径，它描述了所需的时区"。我哪里出错了？

Answer 1

我认为您还必须#include "source.cc"文件，而不仅仅是#include "header.h"文件。在你的情况下，我想你应该补充：#include "Time.cc"或类似的东西。我不知道为什么，但是在使用 Rafat 的 Hussain wavemin 库时，这对我有用，但我只有 4 个文件，有很多文件一定非常乏味。

这就是我所做的（这是 Rafat 和他的库提供的测试代码的修改版本）。

#include "wavemin.h"
#include "waveaux.h"
#include "wavemin.cc"
#include "waveaux.cc"
#include <octave/oct.h>
double ensayo();
double absmax(double *array, int N);
DEFUN_DLD(helloctave2, argv, , "Usage: hello()"){   
    wave_object obj;
    wt_object wt;
    double *inp, *out, *diff;
    int N, i, J;
    char *name = "db4";
    obj = wave_init(name);// Initialize the wavelet
    N = 14;  //Length of Signal
    inp = (double*)malloc(sizeof(double)* N); //Input signal
    out = (double*)malloc(sizeof(double)* N);
    diff = (double*)malloc(sizeof(double)* N);
    //wmean = mean(temp, N);
    for (i = 0; i < N; ++i) {
        inp[i] = i;
    }
    J = 1; //Decomposition Levels
    wt = wt_init(obj, "dwt", N, J);// Initialize the wavelet transform object
    setDWTExtension(wt, "sym");// Options are "per" and "sym". Symmetric is the default option
    setWTConv(wt, "direct");
    dwt(wt, inp);// Perform DWT
    //DWT output can be accessed using wt->output vector. Use wt_summary to find out how to extract appx and detail coefficients
    for (i = 0; i < wt->outlength; ++i) {
    octave_stdout << wt->output[i];
    octave_stdout << "n";
    }
    idwt(wt, out);// Perform IDWT (if needed)
    // Test Reconstruction
    for (i = 0; i < wt->siglength; ++i) {
        diff[i] = out[i] - inp[i];
    }
  octave_stdout << absmax(diff, wt->siglength);
  octave_stdout << "n"; 
  octave_value_list retval;             
  return retval;                            
}       
double
absmax(double *array, int N) {
    double max;
    int i;
    max = 0.0;
    for (i = 0; i < N; ++i) {
        if (fabs(array[i]) >= max) {
            max = fabs(array[i]);
        }
    }
    return max;
}