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1 // hello.cc -- example of a dynamically linked function for Octave. |
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2 |
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3 // To use this file, your version of Octave must support dynamic |
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4 // linking. To find out if it does, type the command |
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5 // |
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6 // octave_config_info ("ENABLE_DYNAMIC_LINKING") |
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7 // |
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8 // at the Octave prompt. Support for dynamic linking is included if |
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9 // this expression returns the string "true". |
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10 // |
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11 // To compile this file, type the command |
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12 // |
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13 // mkoctfile hello.cc |
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14 // |
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15 // at the shell prompt. The script mkoctfile should have been |
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16 // installed along with Octave. Running it will create a file called |
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17 // hello.oct that can be loaded by Octave. To test the hello.oct |
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18 // file, start Octave and type the command |
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19 // |
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20 // hello ("easy as", 1, 2, 3) |
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21 // |
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22 // at the Octave prompt. Octave should respond by printing |
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23 // |
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24 // Hello, world! |
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25 // easy as |
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26 // 1 |
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27 // 2 |
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28 // 3 |
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29 // ans = 3 |
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30 |
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31 // Additional examples are available in the files in the src directory |
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32 // of the Octave distribution that use the macro DEFUN_DLD_BUILTIN. |
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33 // Currently, this includes the files |
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34 // |
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35 // balance.cc fft.cc ifft.cc minmax.cc sort.cc |
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36 // chol.cc fft2.cc ifft2.cc pinv.cc svd.cc |
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37 // colloc.cc filter.cc inv.cc qr.cc syl.cc |
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38 // dassl.cc find.cc log.cc quad.cc |
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39 // det.cc fsolve.cc lsode.cc qzval.cc |
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40 // eig.cc givens.cc lu.cc rand.cc |
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41 // expm.cc hess.cc minmax.cc schur.cc |
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42 // |
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43 // The difference between DEFUN_DLD and DEFUN_DLD_BUILTIN is that |
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44 // DEFUN_DLD_BUILTIN can define a built-in function that is not |
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45 // dynamically loaded if the operating system does not support dynamic |
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46 // linking. To define your own dynamically linked functions you |
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47 // should use DEFUN_DLD. |
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48 |
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49 #include <octave/config.h> |
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50 |
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51 #include <iostream> |
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52 |
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53 #include <octave/defun-dld.h> |
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54 #include <octave/error.h> |
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55 #include <octave/oct-obj.h> |
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56 #include <octave/pager.h> |
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57 #include <octave/symtab.h> |
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58 #include <octave/variables.h> |
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59 |
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60 // DEFUN_DLD and the macros that it depends on are defined in the |
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61 // files defun-dld.h, defun.h, and defun-int.h. |
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62 |
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63 // Note that the third parameter (nargout) is not used, so it is |
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64 // omitted from the list of arguments to DEFUN_DLD in order to avoid |
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65 // the warning from gcc about an unused function parameter. |
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66 |
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67 DEFUN_DLD (hello, args, , |
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68 "[...] = hello (...)\n\ |
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69 \n\ |
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70 Print greeting followed by the values of all the arguments passed.\n\ |
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71 Returns all arguments in reverse order.") |
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72 { |
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73 // The list of values to return. See the declaration in oct-obj.h |
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74 |
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75 octave_value_list retval; |
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76 |
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77 // This stream is normally connected to the pager. |
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78 |
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79 octave_stdout << "Hello, world!\n"; |
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80 |
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81 // The arguments to this function are available in args. |
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82 |
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83 int nargin = args.length (); |
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84 |
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85 // The octave_value_list class is a zero-based array of octave_value |
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86 // objects. The declaration for the octave_value class is in the |
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87 // file ov.h. The print() method will send its output to |
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88 // octave_stdout, so it will also end up going through the pager. |
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89 |
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90 for (int i = 0; i < nargin; i++) |
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91 { |
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92 octave_value tmp = args (i); |
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93 tmp.print (octave_stdout); |
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94 retval (nargin-i-1) = tmp; |
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95 } |
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96 |
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97 return retval; |
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98 } |
