Optional parameters: Difference between revisions
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(Updated to work with Nim 1.4: added missing parameter type, replaced "future" with "sugar", replaced "repeatChar" with "repeat".) |
m (→{{header|Phix}}: added syntax colouring the hard way, phix/basics) |
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=={{header|Phix}}== |
=={{header|Phix}}== |
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{{libheader|Phix/basics}} |
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Optional parameters are specified simply by declaring a default value. They must however be grouped on the right. |
Optional parameters are specified simply by declaring a default value. They must however be grouped on the right. |
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<!--<lang Phix>--> |
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<lang Phix>function increment(integer i, integer inc=1) |
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<span style="color: #008080;">function</span> <span style="color: #000000;">increment</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">inc</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span> |
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return i+inc |
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<span style="color: #008080;">return</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">inc</span> |
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end function |
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<span style="color: #008080;">end</span> <span style="color: #008080;">function</span> |
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?increment(5) -- shows 6 |
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<span style="color: #0000FF;">?</span><span style="color: #000000;">increment</span><span style="color: #0000FF;">(</span><span style="color: #000000;">5</span><span style="color: #0000FF;">)</span> <span style="color: #000080;font-style:italic;">-- shows 6</span> |
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?increment(5,2) -- shows 7</lang> |
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<span style="color: #0000FF;">?</span><span style="color: #000000;">increment</span><span style="color: #0000FF;">(</span><span style="color: #000000;">5</span><span style="color: #0000FF;">,</span><span style="color: #000000;">2</span><span style="color: #0000FF;">)</span> <span style="color: #000080;font-style:italic;">-- shows 7</span> |
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<!--</lang>--> |
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You can also use a variable length sequence to emulate optional parameters. |
You can also use a variable length sequence to emulate optional parameters. |
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<!--<lang Phix>--> |
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<lang Phix>printf(1,"%d records sorted in %3.2s\n",{records,time()-t0})</lang> |
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<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"%d records sorted in %3.2s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">records</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">time</span><span style="color: #0000FF;">()-</span><span style="color: #000000;">t0</span><span style="color: #0000FF;">})</span> |
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<!--</lang>--> |
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In other words printf always accepts exactly three arguments, but the third should contain the correct number of |
In other words printf always accepts exactly three arguments, but the third should contain the correct number of |
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The following incomplete snippet from demo\pGUI\listview.exw shows the basic idea for sorting a table by any column, up or down: |
The following incomplete snippet from demo\pGUI\listview.exw shows the basic idea for sorting a table by any column, up or down: |
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<lang Phix> |
<!--<lang Phix>--> |
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<span style="color: #004080;">integer</span> <span style="color: #000000;">sortcol</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span><span style="color: #0000FF;">,</span> |
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integer sortdir = 1 |
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<span style="color: #000000;">sortdir</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">1</span> |
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function by_column(integer i, integer j) |
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<span style="color: #008080;">function</span> <span style="color: #000000;">by_column</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">j</span><span style="color: #0000FF;">)</span> |
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return sortdir*compare(data[i][sortcol],data[j][sortcol]) |
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<span style="color: #008080;">return</span> <span style="color: #000000;">sortdir</span><span style="color: #0000FF;">*</span><span style="color: #7060A8;">compare</span><span style="color: #0000FF;">(</span><span style="color: #000000;">data</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">][</span><span style="color: #000000;">sortcol</span><span style="color: #0000FF;">],</span><span style="color: #000000;">data</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">][</span><span style="color: #000000;">sortcol</span><span style="color: #0000FF;">])</span> |
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end function |
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<span style="color: #008080;">end</span> <span style="color: #008080;">function</span> |
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sequence tags = tagset(table_size) -- {1,2,..table_size} |
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<span style="color: #004080;">sequence</span> <span style="color: #000000;">tags</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">tagset</span><span style="color: #0000FF;">(</span><span style="color: #000000;">table_size</span><span style="color: #0000FF;">)</span> <span style="color: #000080;font-style:italic;">-- {1,2,..table_size}</span> |
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function click_cb(Ihandle self, integer l, integer c, atom pStatus) |
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<span style="color: #008080;">function</span> <span style="color: #000000;">click_cb</span><span style="color: #0000FF;">(</span><span style="color: #004080;">Ihandle</span> <span style="color: #000000;">self</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">integer</span> <span style="color: #000000;">l</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">integer</span> <span style="color: #000000;">c</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">atom</span> <span style="color: #000000;">pStatus</span><span style="color: #0000FF;">)</span> |
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string sortc |
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<span style="color: #0000FF;">...</span> |
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... |
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<span style="color: #004080;">string</span> <span style="color: #000000;">sortc</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">sprintf</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"SORTSIGN%d"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">c</span><span style="color: #0000FF;">)</span> |
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sortc = sprintf("SORTSIGN%d",c) |
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<span style="color: #000000;">sortdir</span> <span style="color: #0000FF;">=</span> <span style="color: #008080;">iff</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">IupGetAttribute</span><span style="color: #0000FF;">(</span><span style="color: #000000;">self</span><span style="color: #0000FF;">,</span><span style="color: #000000;">sortc</span><span style="color: #0000FF;">)=</span><span style="color: #008000;">"DOWN"</span><span style="color: #0000FF;">?-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">:</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span> |
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sortdir = iff(IupGetAttribute(self,sortc)="DOWN"?-1:1) |
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<span style="color: #7060A8;">IupSetAttribute</span><span style="color: #0000FF;">(</span><span style="color: #000000;">self</span><span style="color: #0000FF;">,</span><span style="color: #000000;">sortc</span><span style="color: #0000FF;">,</span><span style="color: #008080;">iff</span><span style="color: #0000FF;">(</span><span style="color: #000000;">sortdir</span><span style="color: #0000FF;">=-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">?</span><span style="color: #008000;">"UP"</span><span style="color: #0000FF;">:</span><span style="color: #008000;">"DOWN"</span><span style="color: #0000FF;">))</span> |
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IupSetAttribute(self,sortc,iff(sortdir=-1?"UP":"DOWN")) |
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<span style="color: #000000;">sortcol</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">c</span> |
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sortcol = c |
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<span style="color: #000000;">tags</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">custom_sort</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">routine_id</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"by_column"</span><span style="color: #0000FF;">),</span><span style="color: #000000;">tags</span><span style="color: #0000FF;">)</span> |
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tags = custom_sort(routine_id("by_column"),tags) |
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<span style="color: #008080;">function</span> <span style="color: #000000;">value_cb</span><span style="color: #0000FF;">(</span><span style="color: #004080;">Ihandle</span> <span style="color: #000080;font-style:italic;">/*self*/</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">integer</span> <span style="color: #000000;">l</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">c</span><span style="color: #0000FF;">)</span> |
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function value_cb(Ihandle /*self*/, integer l, integer c) |
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<span style="color: #000000;">l</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">tags</span><span style="color: #0000FF;">[</span><span style="color: #000000;">l</span><span style="color: #0000FF;">]</span> |
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l = tags[l] |
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<span style="color: #008080;">return</span> <span style="color: #000000;">data</span><span style="color: #0000FF;">[</span><span style="color: #000000;">l</span><span style="color: #0000FF;">][</span><span style="color: #000000;">c</span><span style="color: #0000FF;">]</span> |
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return data[l][c] |
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<span style="color: #008080;">end</span> <span style="color: #008080;">function</span> |
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end function</lang> |
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<!--</lang>--> |
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=={{header|Phixmonti}}== |
=={{header|Phixmonti}}== |
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