Class: FFI::StructLayout::Field
- Inherits:
-
Object
- Object
- FFI::StructLayout::Field
- Defined in:
- ext/ffi_c/StructLayout.c,
ext/ffi_c/StructLayout.c
Overview
A field in a FFI::StructLayout.
Instance Method Summary collapse
-
#alignment ⇒ Numeric
Get the field alignment.
-
#get(pointer) ⇒ Object
Get an object of type #type from memory pointed by
pointer
. -
#initialize(name, offset, type) ⇒ self
constructor
A new FFI::StructLayout::Field instance.
-
#name ⇒ Symbol
Get the field name.
-
#offset ⇒ Numeric
Get the field offset.
-
#put(pointer, value) ⇒ self
Put an object to memory pointed by
pointer
. -
#size ⇒ Numeric
Get the field size.
-
#type ⇒ Type
Get the field type.
Constructor Details
#initialize(name, offset, type) ⇒ self
A new FFI::StructLayout::Field instance.
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# File 'ext/ffi_c/StructLayout.c', line 97
static VALUE
struct_field_initialize(int argc, VALUE* argv, VALUE self)
{
VALUE rbOffset = Qnil, rbName = Qnil, rbType = Qnil;
StructField* field;
int nargs;
Data_Get_Struct(self, StructField, field);
nargs = rb_scan_args(argc, argv, "3", &rbName, &rbOffset, &rbType);
if (TYPE(rbName) != T_SYMBOL && TYPE(rbName) != T_STRING) {
rb_raise(rb_eTypeError, "wrong argument type %s (expected Symbol/String)",
rb_obj_classname(rbName));
}
Check_Type(rbOffset, T_FIXNUM);
if (!rb_obj_is_kind_of(rbType, rbffi_TypeClass)) {
rb_raise(rb_eTypeError, "wrong argument type %s (expected FFI::Type)",
rb_obj_classname(rbType));
}
field->offset = NUM2UINT(rbOffset);
field->rbName = (TYPE(rbName) == T_SYMBOL) ? rbName : rb_str_intern(rbName);
field->rbType = rbType;
Data_Get_Struct(field->rbType, Type, field->type);
field->memoryOp = get_memory_op(field->type);
field->referenceIndex = -1;
switch (field->type->nativeType == NATIVE_MAPPED ? ((MappedType *) field->type)->type->nativeType : field->type->nativeType) {
case NATIVE_FUNCTION:
case NATIVE_CALLBACK:
case NATIVE_POINTER:
field->referenceRequired = true;
break;
default:
field->referenceRequired = (rb_respond_to(self, rb_intern("reference_required?"))
&& RTEST(rb_funcall2(self, rb_intern("reference_required?"), 0, NULL)))
|| (rb_respond_to(rbType, rb_intern("reference_required?"))
&& RTEST(rb_funcall2(rbType, rb_intern("reference_required?"), 0, NULL)));
break;
}
return self;
}
|
Instance Method Details
#alignment ⇒ Numeric
Get the field alignment.
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# File 'ext/ffi_c/StructLayout.c', line 176
static VALUE
struct_field_alignment(VALUE self)
{
StructField* field;
Data_Get_Struct(self, StructField, field);
return UINT2NUM(field->type->ffiType->alignment);
}
|
#get(pointer) ⇒ Object
Get an object of type #type from memory pointed by pointer
.
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# File 'ext/ffi_c/StructLayout.c', line 217
static VALUE
struct_field_get(VALUE self, VALUE pointer)
{
StructField* f;
Data_Get_Struct(self, StructField, f);
if (f->memoryOp == NULL) {
rb_raise(rb_eArgError, "get not supported for %s", rb_obj_classname(f->rbType));
return Qnil;
}
return (*f->memoryOp->get)(MEMORY(pointer), f->offset);
}
|
#name ⇒ Symbol
Get the field name.
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# File 'ext/ffi_c/StructLayout.c', line 203
static VALUE
struct_field_name(VALUE self)
{
StructField* field;
Data_Get_Struct(self, StructField, field);
return field->rbName;
}
|
#offset ⇒ Numeric
Get the field offset.
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# File 'ext/ffi_c/StructLayout.c', line 150
static VALUE
struct_field_offset(VALUE self)
{
StructField* field;
Data_Get_Struct(self, StructField, field);
return UINT2NUM(field->offset);
}
|
#put(pointer, value) ⇒ self
Put an object to memory pointed by pointer
.
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# File 'ext/ffi_c/StructLayout.c', line 238
static VALUE
struct_field_put(VALUE self, VALUE pointer, VALUE value)
{
StructField* f;
Data_Get_Struct(self, StructField, f);
if (f->memoryOp == NULL) {
rb_raise(rb_eArgError, "put not supported for %s", rb_obj_classname(f->rbType));
return self;
}
(*f->memoryOp->put)(MEMORY(pointer), f->offset, value);
return self;
}
|
#size ⇒ Numeric
Get the field size.
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# File 'ext/ffi_c/StructLayout.c', line 163
static VALUE
struct_field_size(VALUE self)
{
StructField* field;
Data_Get_Struct(self, StructField, field);
return UINT2NUM(field->type->ffiType->size);
}
|
#type ⇒ Type
Get the field type.
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# File 'ext/ffi_c/StructLayout.c', line 189
static VALUE
struct_field_type(VALUE self)
{
StructField* field;
Data_Get_Struct(self, StructField, field);
return field->rbType;
}
|