60 lines
1.5 KiB
Nim
60 lines
1.5 KiB
Nim
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# stew
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# Copyright 2018-2019 Status Research & Development GmbH
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# Licensed under either of
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#
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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#
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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import unittest
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import ../stew/ptrops
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var ints = [2, 3, 4]
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suite "ptrops":
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test "offset pointer":
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let
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p0: pointer = addr ints[0]
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p1: pointer = addr ints[1]
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check:
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p0.offset(sizeof(int)) == p1
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p1.offset(-sizeof(int)) == p0
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test "offset ptr":
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let
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p0 = addr ints[0]
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p1 = addr ints[1]
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check:
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p0.offset(0)[] == ints[0]
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p0.offset(1)[] == ints[1]
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p1.offset(-1)[] == ints[0]
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p0.offset(1) == p1
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p1.offset(-1) == p0
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test "offset max pointer (no overflows!)":
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check:
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cast[pointer](int.high()).offset(3) ==
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cast[pointer](cast[uint](int.high) + 3)
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cast[ptr uint16](int.high()).offset(3) ==
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cast[pointer](cast[uint](int.high) + 6)
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test "distance pointer":
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let
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p0: pointer = addr ints[0]
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p1: pointer = addr ints[2]
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check:
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p0.distance(p0) == 0
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p0.distance(p1) == sizeof(int) * 2
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p1.distance(p0) == -sizeof(int) * 2
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test "distance ptr uint16":
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let
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p0 = addr ints[0]
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p1 = addr ints[2]
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check:
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p0.distance(p0) == 0
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p0.distance(p1) == 2
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p1.distance(p0) == -2
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