HCoop / hcoop / debian / mlton.git / blame
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1 | <!DOCTYPE html>\r |
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| 5 | <meta name="generator" content="AsciiDoc 8.6.9">\r | |
| 6 | <title>Utilities</title>\r | |
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| 18 | </head>\r | |
| 19 | <body class="article">\r | |
| 20 | <div id="banner">\r | |
| 21 | <div id="banner-home">\r | |
| 22 | <a href="./Home">MLton 20180207</a>\r | |
| 23 | </div>\r | |
| 24 | </div>\r | |
| 25 | <div id="header">\r | |
| 26 | <h1>Utilities</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>This page is a collection of basic utilities used in the examples on\r | |
| 32 | various pages. See</p></div>\r | |
| 33 | <div class="ulist"><ul>\r | |
| 34 | <li>\r | |
| 35 | <p>\r | |
| 36 | <a href="InfixingOperators">InfixingOperators</a>, and\r | |
| 37 | </p>\r | |
| 38 | </li>\r | |
| 39 | <li>\r | |
| 40 | <p>\r | |
| 41 | <a href="ProductType">ProductType</a>\r | |
| 42 | </p>\r | |
| 43 | </li>\r | |
| 44 | </ul></div>\r | |
| 45 | <div class="paragraph"><p>for longer discussions on some of these utilities.</p></div>\r | |
| 46 | <div class="listingblock">\r | |
| 47 | <div class="content"><div class="highlight"><pre><span class="cm">(* Operator precedence table *)</span><span class="w"></span>\r | |
| 48 | <span class="k">infix</span><span class="w"> </span><span class="mi">8</span><span class="w"> </span><span class="n">*</span><span class="w"> </span><span class="n">/</span><span class="w"> </span><span class="n">div</span><span class="w"> </span><span class="n">mod</span><span class="w"> </span><span class="cm">(* +1 from Basis Library *)</span><span class="w"></span>\r | |
| 49 | <span class="k">infix</span><span class="w"> </span><span class="mi">7</span><span class="w"> </span><span class="n">+</span><span class="w"> </span><span class="n">-</span><span class="w"> </span><span class="n">^</span><span class="w"> </span><span class="cm">(* +1 from Basis Library *)</span><span class="w"></span>\r | |
| 50 | <span class="k">infixr</span><span class="w"> </span><span class="mi">6</span><span class="w"> </span><span class="n">::</span><span class="w"> </span><span class="n">@</span><span class="w"> </span><span class="cm">(* +1 from Basis Library *)</span><span class="w"></span>\r | |
| 51 | <span class="k">infix</span><span class="w"> </span><span class="mi">5</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n"><></span><span class="w"> </span><span class="n">></span><span class="w"> </span><span class="n">>=</span><span class="w"> </span><span class="n"><</span><span class="w"> </span><span class="n"><=</span><span class="w"> </span><span class="cm">(* +1 from Basis Library *)</span><span class="w"></span>\r | |
| 52 | <span class="k">infix</span><span class="w"> </span><span class="mi">4</span><span class="w"> </span><span class="n"><\</span><span class="w"> </span><span class="n">\></span><span class="w"></span>\r | |
| 53 | <span class="k">infixr</span><span class="w"> </span><span class="mi">4</span><span class="w"> </span><span class="n"></</span><span class="w"> </span><span class="n">/></span><span class="w"></span>\r | |
| 54 | <span class="k">infix</span><span class="w"> </span><span class="mi">3</span><span class="w"> </span><span class="n">o</span><span class="w"></span>\r | |
| 55 | <span class="k">infix</span><span class="w"> </span><span class="mi">2</span><span class="w"> </span><span class="n">>|</span><span class="w"></span>\r | |
| 56 | <span class="k">infixr</span><span class="w"> </span><span class="mi">2</span><span class="w"> </span><span class="n">|<</span><span class="w"></span>\r | |
| 57 | <span class="k">infix</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="n">:=</span><span class="w"> </span><span class="cm">(* -2 from Basis Library *)</span><span class="w"></span>\r | |
| 58 | <span class="k">infix</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="n">before</span><span class="w"> </span><span class="n">&</span><span class="w"></span>\r | |
| 59 | \r | |
| 60 | <span class="cm">(* Some basic combinators *)</span><span class="w"></span>\r | |
| 61 | <span class="k">fun</span><span class="w"> </span><span class="n">const</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="p">_</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">x</span><span class="w"></span>\r | |
| 62 | <span class="k">fun</span><span class="w"> </span><span class="n">cross</span><span class="w"> </span><span class="p">(</span><span class="n">f</span><span class="p">,</span><span class="w"> </span><span class="n">g</span><span class="p">)</span><span class="w"> </span><span class="p">(</span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n">y</span><span class="p">)</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">(</span><span class="n">f</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n">g</span><span class="w"> </span><span class="n">y</span><span class="p">)</span><span class="w"></span>\r | |
| 63 | <span class="k">fun</span><span class="w"> </span><span class="n">curry</span><span class="w"> </span><span class="n">f</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="n">y</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">f</span><span class="w"> </span><span class="p">(</span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n">y</span><span class="p">)</span><span class="w"></span>\r | |
| 64 | <span class="k">fun</span><span class="w"> </span><span class="n">fail</span><span class="w"> </span><span class="n">e</span><span class="w"> </span><span class="p">_</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="k">raise</span><span class="w"> </span><span class="n">e</span><span class="w"></span>\r | |
| 65 | <span class="k">fun</span><span class="w"> </span><span class="n">id</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">x</span><span class="w"></span>\r | |
| 66 | \r | |
| 67 | <span class="cm">(* Product type *)</span><span class="w"></span>\r | |
| 68 | <span class="k">datatype</span><span class="w"> </span><span class="p">(</span><span class="n">'a</span><span class="p">,</span><span class="w"> </span><span class="n">'b</span><span class="p">)</span><span class="w"> </span><span class="n">product</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">&</span><span class="w"> </span><span class="k">of</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">*</span><span class="w"> </span><span class="n">'b</span><span class="w"></span>\r | |
| 69 | \r | |
| 70 | <span class="cm">(* Sum type *)</span><span class="w"></span>\r | |
| 71 | <span class="k">datatype</span><span class="w"> </span><span class="p">(</span><span class="n">'a</span><span class="p">,</span><span class="w"> </span><span class="n">'b</span><span class="p">)</span><span class="w"> </span><span class="n">sum</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">INL</span><span class="w"> </span><span class="k">of</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="n">INR</span><span class="w"> </span><span class="k">of</span><span class="w"> </span><span class="n">'b</span><span class="w"></span>\r | |
| 72 | \r | |
| 73 | <span class="cm">(* Some type shorthands *)</span><span class="w"></span>\r | |
| 74 | <span class="k">type</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">uop</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">'a</span><span class="w"></span>\r | |
| 75 | <span class="k">type</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">fix</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">uop</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">'a</span><span class="w"></span>\r | |
| 76 | <span class="k">type</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">thunk</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">'a</span><span class="w"></span>\r | |
| 77 | <span class="k">type</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">effect</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">unit</span><span class="w"></span>\r | |
| 78 | <span class="k">type</span><span class="w"> </span><span class="p">(</span><span class="n">'a</span><span class="p">,</span><span class="w"> </span><span class="n">'b</span><span class="p">)</span><span class="w"> </span><span class="n">emb</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">(</span><span class="n">'a</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">'b</span><span class="p">)</span><span class="w"> </span><span class="n">*</span><span class="w"> </span><span class="p">(</span><span class="n">'b</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">'a</span><span class="p">)</span><span class="w"></span>\r | |
| 79 | \r | |
| 80 | <span class="cm">(* Infixing, sectioning, and application operators *)</span><span class="w"></span>\r | |
| 81 | <span class="k">fun</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="n"><\</span><span class="w"> </span><span class="n">f</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="k">fn</span><span class="w"> </span><span class="n">y</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">f</span><span class="w"> </span><span class="p">(</span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n">y</span><span class="p">)</span><span class="w"></span>\r | |
| 82 | <span class="k">fun</span><span class="w"> </span><span class="n">f</span><span class="w"> </span><span class="n">\></span><span class="w"> </span><span class="n">y</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">f</span><span class="w"> </span><span class="n">y</span><span class="w"></span>\r | |
| 83 | <span class="k">fun</span><span class="w"> </span><span class="n">f</span><span class="w"> </span><span class="n">/></span><span class="w"> </span><span class="n">y</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="k">fn</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">f</span><span class="w"> </span><span class="p">(</span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n">y</span><span class="p">)</span><span class="w"></span>\r | |
| 84 | <span class="k">fun</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="n"></</span><span class="w"> </span><span class="n">f</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">f</span><span class="w"> </span><span class="n">x</span><span class="w"></span>\r | |
| 85 | \r | |
| 86 | <span class="cm">(* Piping operators *)</span><span class="w"></span>\r | |
| 87 | <span class="k">val</span><span class="w"> </span><span class="k">op</span><span class="n">>|</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="k">op</span><span class="n"></</span><span class="w"></span>\r | |
| 88 | <span class="k">val</span><span class="w"> </span><span class="k">op</span><span class="n">|<</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="k">op</span><span class="n">\></span><span class="w"></span>\r | |
| 89 | </pre></div></div></div>\r | |
| 90 | </div>\r | |
| 91 | </div>\r | |
| 92 | </div>\r | |
| 93 | <div id="footnotes"><hr></div>\r | |
| 94 | <div id="footer">\r | |
| 95 | <div id="footer-text">\r | |
| 96 | </div>\r | |
| 97 | <div id="footer-badges">\r | |
| 98 | </div>\r | |
| 99 | </div>\r | |
| 100 | </body>\r | |
| 101 | </html>\r |