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80 lines
3.4 KiB
C++
80 lines
3.4 KiB
C++
/*
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**************************************************************
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* C++ Mathematical Expression Toolkit Library *
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* *
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* Simple Example 18 *
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* Author: Arash Partow (1999-2017) *
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* URL: http://www.partow.net/programming/exprtk/index.html *
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* *
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* Copyright notice: *
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* Free use of the Mathematical Expression Toolkit Library is *
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* permitted under the guidelines and in accordance with the *
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* most current version of the MIT License. *
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* http://www.opensource.org/licenses/MIT *
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* *
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**************************************************************
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*/
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#include <cstdio>
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#include <string>
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#include "exprtk.hpp"
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template <typename T>
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void file_io()
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{
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typedef exprtk::symbol_table<T> symbol_table_t;
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typedef exprtk::expression<T> expression_t;
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typedef exprtk::parser<T> parser_t;
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std::string fileio_program =
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" var file_name := 'file.txt'; "
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" var stream := null; "
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" "
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" if (stream := open(file_name,'w')) "
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" println('Successfully opened file: ' + file_name); "
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" else "
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" { "
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" println('Failed to open file: ' + file_name); "
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" return [false]; "
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" } "
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" "
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" var s := 'Hello world...\n'; "
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" "
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" for (var i := 0; i < 10; i += 1) "
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" { "
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" write(stream,s); "
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" } "
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" "
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" if (close(stream)) "
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" println('Sucessfully closed file: ' + file_name); "
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" else "
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" { "
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" println('Failed to close file: ' + file_name); "
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" return [false]; "
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" } ";
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exprtk::rtl::io::file::package<T> fileio_package;
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exprtk::rtl::io::println<T> println;
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symbol_table_t symbol_table;
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symbol_table.add_function("println",println);
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symbol_table.add_package (fileio_package );
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expression_t expression;
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expression.register_symbol_table(symbol_table);
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parser_t parser;
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parser.compile(fileio_program,expression);
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printf("Result %10.3f\n",expression.value());
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}
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int main()
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{
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file_io<double>();
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return 0;
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}
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