[Boost-commit] svn:boost r60382 - branches/units/autoprefix/libs/units/example

Subject: [Boost-commit] svn:boost r60382 - branches/units/autoprefix/libs/units/example
From: pbristow_at_[hidden]
Date: 2010-03-09 11:06:43

Author: pbristow
Date: 2010-03-09 11:06:42 EST (Tue, 09 Mar 2010)
New Revision: 60382
URL: http://svn.boost.org/trac/boost/changeset/60382

Log:
Draft of autoprefixes.cpp examples.
Added:
   branches/units/autoprefix/libs/units/example/autoprefixes.cpp   (contents, props changed)

Added: branches/units/autoprefix/libs/units/example/autoprefixes.cpp
==============================================================================
--- (empty file)
+++ branches/units/autoprefix/libs/units/example/autoprefixes.cpp	2010-03-09 11:06:42 EST (Tue, 09 Mar 2010)
@@ -0,0 +1,106 @@
+// Boost.Units - A C++ library for zero-overhead dimensional analysis and 
+// unit/quantity manipulation and conversion
+//
+// Copyright (C) 2003-2008 Matthias Christian Schabel
+// Copyright (C) 2008 Steven Watanabe
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+/** 
+\file
+    
+\brief Example of using autoprefixes.
+
+\details
+Example of using engineering (10^3) and binary (2^10) autoprefixes.
+
+Output:
+@verbatim
+
+//[autoprefixes_output
+L             = m
+meter*meter   = m^2
+M*(L/T)*(L/T) = m^2 kg s^-2
+M*(L/T)^2     = m^2 kg s^-2
+L^3           = m^3
+L^(3/2)       = m^(3/2)
+2vM           = kg^(1/2)
+(3/2)vM       = kg^(2/3)
+//] [/autoprefixes_output
+
+@endverbatim
+**/
+
+#include <iostream>
+
+#include <boost/units/io.hpp>
+#include <boost/units/pow.hpp>
+#include <boost/units/systems/si.hpp>
+#include <boost/units/systems/si/io.hpp>
+#include <boost/units/quantity.hpp>
+
+struct byte_base_unit : boost::units::base_unit<byte_base_unit, boost::units::dimensionless_type, 3>
+{
+    static const char* name() { return("byte"); }
+    static const char* symbol() { return("b"); }
+};
+
+int main()
+{
+  using std::cout;
+  using std::endl;
+  using namespace boost::units;
+  using namespace boost::units::si;
+
+  using boost::units::binary_prefix;
+  using boost::units::engineering_prefix;
+
+ //[autoprefixes_snippet_1
+  quantity<length> l = 2.345 * meters;   // A quantity of length, in units of meters.
+  cout << boost::units::engineering_prefix << l << endl; // Outputs "2.345 m".
+  //l = l * 1000; // Increase it by 1000, so expect a k prefix.// Note Fails if integer.
+
+  l =  1000. * l; // Increase it by 1000, so expect a k prefix.
+  cout << boost::units::engineering_prefix << l << endl; // Output autoprefixed with k to "2.345 km".
+
+  quantity<energy> e = kilograms * pow<2>(l / seconds); // A quantity of energy.
+  cout << boost::units::engineering_prefix << e << endl; // 5.49902 MJ
+  cout << name_format << boost::units::engineering_prefix << e << endl; // 5.49902 megaJoule
+
+  //] [/autoprefixes_snippet_1]
+
+ 
+  //[autoprefixes_snippet_2
+  // Don't forget that the name or symbol format specification is persistent.
+  cout << symbol_format << endl; // So this resets the format to the default symbol.
+
+  quantity<byte_base_unit, dimensionless> b = 2048. * byte_base_unit::unit_type();
+
+  cout << b << endl; 
+  cout << symbol_format << binary_prefix << b << endl; //  "2 kibibyte" 
+
+
+  //] [/autoprefixes_snippet_2]
+
+  //[autoprefixes_snippet_3
+  // Note that scalar dimensionless values are *not* prefixed automatically by the engineering_prefix or binary_prefix iostream manipulators.
+  const double s1 = 2345.6;
+  const long x1 = 23456;
+  cout << boost::units::engineering_prefix << s1 << endl; // 2345.6
+  cout << boost::units::engineering_prefix << x1 << endl; // 23456
+
+  cout << boost::units::binary_prefix << s1 << endl; // 2345.6
+  cout << boost::units::binary_prefix << x1 << endl; // 23456
+
+  const length L; // A unit of length (but not a quantity of length).
+  cout << L << endl; // default length unit is meter,
+  // but default is symbol format so output is just "m".
+  cout << name_format << L << endl; // default length name is "meter".
+  //] [/autoprefixes_snippet_3]
+
+ 
+    return 0;
+} // int main()
+