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https://github.com/Mercury-Language/mercury.git
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5fa7d13b90
While these casts can be implemented by casting via uint, the resulting
code is less readable than code that uses direct casts.
library/uint32.m:
Add cast_from_uint16/1 and cast_to_uint16/1.
NEWS:
Announce the above additions.
tests/hard_coded/Mmakefile:
tests/hard_coded/uint32_uint16_casts.{m,exp}:
Add tests for the new casts.
94 lines
2.0 KiB
Mathematica
94 lines
2.0 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ft=mercury ts=4 sw=4 et
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%---------------------------------------------------------------------------%
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%
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% Test casting uint32s to/from uint16s.
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%
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%---------------------------------------------------------------------------%
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:- module uint32_uint16_casts.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is det.
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%---------------------------------------------------------------------------%
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%---------------------------------------------------------------------------%
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:- implementation.
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:- import_module list.
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:- import_module string.
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:- import_module uint32.
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:- import_module uint16.
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%---------------------------------------------------------------------------%
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main(!IO) :-
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list.foldl(do_cast_from_uint16_test, uint16s, !IO),
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io.nl(!IO),
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list.foldl(do_cast_to_uint16_test, uint32s, !IO).
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:- pred do_cast_from_uint16_test(uint16::in, io::di, io::uo) is det.
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do_cast_from_uint16_test(U8, !IO) :-
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io.format("cast_from_uint16(%uu16) = %uu32\n",
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[u16(U8), u32(cast_from_uint16(U8))], !IO).
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:- pred do_cast_to_uint16_test(uint32::in, io::di, io::uo) is det.
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do_cast_to_uint16_test(U32, !IO) :-
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io.format("cast_to_uint16(%uu32) = %uu16\n",
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[u32(U32), u16(cast_to_uint16(U32))], !IO).
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:- func uint16s = list(uint16).
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uint16s = [
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0u16,
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7u16,
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8u16,
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15u16,
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16u16,
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31u16,
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32u16,
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63u16,
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64u16,
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127u16,
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128u16,
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254u16,
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255u16,
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32766u16,
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32767u16,
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32768u16,
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65534u16,
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65535u16
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].
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:- func uint32s = list(uint32).
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uint32s = [
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0u32,
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7u32,
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8u32,
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15u32,
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16u32,
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31u32,
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32u32,
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63u32,
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64u32,
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127u32,
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128u32,
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254u32,
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255u32,
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32766u32,
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32767u32,
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32768u32,
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65534u32,
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65535u32
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].
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%---------------------------------------------------------------------------%
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:- end_module uint32_uint16_casts.
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%---------------------------------------------------------------------------%
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