Description
The sizeof operator yields the size (in bytes) of its operand, including
any padding bytes needed for alignment, which may be
an expression or the parenthesized name of a type.
The size is determined from the type of the operand.
The result is of type size_t.
If the type of the operand is a variable length array
[1] type, the operand is
evaluated; otherwise, the operand is not evaluated and the result is an integer
constant.
When applied to an operand that has type char or uchar, the result is 1.
When applied to an operand that has type short, ushort, or half the
result is 2.
When applied to an operand that has type int, uint or float, the
result is 4.
When applied to an operand that has type long, ulong or double, the
result is 8.
When applied to an operand that is a vector type, the result is the number of
components times the size of each scalar component [2].
When applied to an operand that has array type, the result is the total
number of bytes in the array.
When applied to an operand that has structure or union type, the result is
the total number of bytes in such an object, including internal and trailing
padding.
The sizeof operator shall not be applied to an expression that has
function type or an incomplete type, to the parenthesized name of such a
type, or to an expression that designates a bit-field struct member
[3].
The behavior of applying the sizeof operator to the bool, image2d_t,
image3d_t, image2d_array_t, image1d_t, image1d_buffer_t,
image1d_array_t, image2d_depth_t, image2d_array_depth_t,
sampler_t, queue_t, ndrange_t, clk_event_t, reserve_id_t, and
event_t types is implementation-defined. Additionally, the behavior of
applying the sizeof operator to a pipe object (a type with the pipe type
specifier keyword) is implementation-defined.
Document Notes
For more information, see the OpenCL C Specification
This page is extracted from the OpenCL C Specification. Fixes and changes should be made to the Specification, not directly.