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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Mu - 045space_surround.cc</title> <meta name="Generator" content="Vim/7.4"> <meta name="plugin-version" content="vim7.4_v1"> <meta name="syntax" content="cpp"> <meta name="settings" content="use_css,pre_wrap,no_foldcolumn,expand_tabs,prevent_copy="> <meta name="colorscheme" content="minimal"> <style type="text/css">  </style> <script type='text/javascript'>  </script> </head> <body> <pre id='vimCodeElement'> //: So far you can have global variables by not setting default-space, and //: local variables by setting default-space. You can isolate variables //: between those extremes by creating 'surrounding' spaces. //: //: (Surrounding spaces are like lexical scopes in other languages.) :(scenario surrounding_space) # location 1 in space 1 refers to the space surrounding the default space, here 20. recipe main [ 10:number <- copy 5 # pretend array 20:number <- copy 5 # pretend array default-space:address:array:location <- copy 10 0:address:array:location/names:dummy <- copy 20 # later layers will explain the /names: property 1:number <- copy 32 1:number/space:1 <- copy 33 ] # chain space +mem: storing 20 in location 11 # store to default-space +mem: storing 32 in location 12 # store to chained space +mem: storing 33 in location 22 //: If you think of a space as a collection of variables with a common //: lifetime, surrounding allows managing shorter lifetimes inside a longer //: one. :(replace{} "long long int space_base(const reagent& x)") long long int space_base(const reagent& x) { return space_base(x, space_index(x), Current_routine->calls.front().default_space); } long long int space_base(const reagent& x, long long int space_index, long long int base) { if (space_index == 0) { return base; } long long int result = space_base(x, space_index-1, Memory[base+1]); return result; } long long int space_index(const reagent& x) { for (long long int i = /*skip name:type*/1; i < SIZE(x.properties); ++i) { if (x.properties.at(i).first == "space") { if (SIZE(x.properties.at(i).second) != 1) raise << current_recipe_name() << ": /space metadata should take exactly one value in " << x.original_string << '\n' << end(); return to_integer(x.properties.at(i).second.at(0)); } } return 0; } :(scenario permit_space_as_variable_name) recipe main [ space:number <- copy 0 ] </pre> </body> </html>


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