Import Upstream version 20180207
[hcoop/debian/mlton.git] / doc / guide / localhost / PhantomType
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22<a href="./Home">MLton 20180207</a>\r
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25<div id="header">\r
26<h1>PhantomType</h1>\r
27</div>\r
28<div id="content">\r
29<div id="preamble">\r
30<div class="sectionbody">\r
31<div class="paragraph"><p>A phantom type is a type that has no run-time representation, but is\r
32used to force the type checker to ensure invariants at compile time.\r
33This is done by augmenting a type with additional arguments (phantom\r
34type variables) and expressing constraints by choosing phantom types\r
35to stand for the phantom types in the types of values.</p></div>\r
36</div>\r
37</div>\r
38<div class="sect1">\r
39<h2 id="_also_see">Also see</h2>\r
40<div class="sectionbody">\r
41<div class="ulist"><ul>\r
42<li>\r
43<p>\r
44<a href="References#Blume01">Blume01</a>\r
45</p>\r
46<div class="ulist"><ul>\r
47<li>\r
48<p>\r
49dimensions\r
50</p>\r
51</li>\r
52<li>\r
53<p>\r
54C type system\r
55</p>\r
56</li>\r
57</ul></div>\r
58</li>\r
59<li>\r
60<p>\r
61<a href="References#FluetPucella06">FluetPucella06</a>\r
62</p>\r
63<div class="ulist"><ul>\r
64<li>\r
65<p>\r
66subtyping\r
67</p>\r
68</li>\r
69</ul></div>\r
70</li>\r
71<li>\r
72<p>\r
73socket module in <a href="BasisLibrary">Basis Library</a>\r
74</p>\r
75</li>\r
76</ul></div>\r
77</div>\r
78</div>\r
79</div>\r
80<div id="footnotes"><hr></div>\r
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