LightGBM/swig/pointer_manipulation.i

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/*!
* Copyright (c) 2018 Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See LICENSE file in the project root for license information.
*/
/*!
* This SWIG interface extension provides support to
* the pointer manipulation methods present in the standard
* SWIG wrappers, but with support for larger arrays.
*
* SWIG provides this in https://github.com/swig/swig/blob/master/Lib/carrays.i
* but the standard methods only provide arrays with up to
* max(int32_t) elements.
*
* The `long_array_functions` wrappers extend this
* to arrays of size max(int64_t) instead of max(int32_t).
*/
%pointer_functions(int, intp)
%pointer_functions(long, longp)
%pointer_functions(double, doublep)
%pointer_functions(float, floatp)
%pointer_functions(int64_t, int64_tp)
%pointer_functions(int32_t, int32_tp)
%pointer_functions(size_t, size_tp)
%pointer_cast(int64_t *, long *, int64_t_to_long_ptr)
%pointer_cast(int64_t *, double *, int64_t_to_double_ptr)
%pointer_cast(int32_t *, int *, int32_t_to_int_ptr)
%pointer_cast(long *, int64_t *, long_to_int64_t_ptr)
%pointer_cast(double *, int64_t *, double_to_int64_t_ptr)
%pointer_cast(int *, int32_t *, int_to_int32_t_ptr)
%pointer_cast(double *, void *, double_to_voidp_ptr)
%pointer_cast(float *, void *, float_to_voidp_ptr)
%pointer_cast(int *, void *, int_to_voidp_ptr)
%pointer_cast(int32_t *, void *, int32_t_to_voidp_ptr)
%pointer_cast(int64_t *, void *, int64_t_to_voidp_ptr)
/* Custom pointer manipulation template */
%define %pointer_manipulation(TYPE, NAME)
%{
static TYPE *new_##NAME() { %}
%{ TYPE* NAME = new TYPE; return NAME; %}
%{}
static void delete_##NAME(TYPE *self) { %}
%{ if (self) delete self; %}
%{}
%}
TYPE *new_##NAME();
void delete_##NAME(TYPE *self);
%enddef
%define %pointer_dereference(TYPE, NAME)
%{
static TYPE NAME ##_value(TYPE *self) {
TYPE NAME = *self;
return NAME;
}
%}
TYPE NAME##_value(TYPE *self);
%enddef
%define %pointer_handle(TYPE, NAME)
%{
static TYPE* NAME ##_handle() { %}
%{ TYPE* NAME = new TYPE; *NAME = (TYPE)operator new(sizeof(int*)); return NAME; %}
%{}
%}
TYPE *NAME##_handle();
%enddef
%define %long_array_functions(TYPE,NAME)
%{
static TYPE *new_##NAME(int64_t nelements) { %}
%{ return new TYPE[nelements](); %}
%{}
static void delete_##NAME(TYPE *ary) { %}
%{ delete [] ary; %}
%{}
static TYPE NAME##_getitem(TYPE *ary, int64_t index) {
return ary[index];
}
static void NAME##_setitem(TYPE *ary, int64_t index, TYPE value) {
ary[index] = value;
}
%}
TYPE *new_##NAME(int64_t nelements);
void delete_##NAME(TYPE *ary);
TYPE NAME##_getitem(TYPE *ary, int64_t index);
void NAME##_setitem(TYPE *ary, int64_t index, TYPE value);
%enddef
%long_array_functions(double, doubleArray)
%long_array_functions(float, floatArray)
%long_array_functions(int, intArray)
%long_array_functions(long, longArray)
%pointer_manipulation(void*, voidpp)
/* Allow dereferencing of void** to void* */
%pointer_dereference(void*, voidpp)
/* Allow retrieving handle to void** */
%pointer_handle(void*, voidpp)