Subject: [Boost-commit] svn:boost r65803 - sandbox/variadic_templates/libs/composite_storage/sandbox
From: cppljevans_at_[hidden]
Date: 2010-10-07 09:03:02
Author: cppljevans
Date: 2010-10-07 09:02:59 EDT (Thu, 07 Oct 2010)
New Revision: 65803
URL: http://svn.boost.org/trac/boost/changeset/65803
Log:
Because having trouble with commiting layout_all.cpp
(svn says already exists or something similar)
had to rename the file to this one and add it :(
Added:
sandbox/variadic_templates/libs/composite_storage/sandbox/layout_all.1.cpp (contents, props changed)
Added: sandbox/variadic_templates/libs/composite_storage/sandbox/layout_all.1.cpp
==============================================================================
--- (empty file)
+++ sandbox/variadic_templates/libs/composite_storage/sandbox/layout_all.1.cpp 2010-10-07 09:02:59 EDT (Thu, 07 Oct 2010)
@@ -0,0 +1,195 @@
+//Purpose:
+// 1) Show padding in aligned struct's.
+// 2) Partial response to post:
+// http://listarchives.boost.org/Archives/boost/2010/10/171569.php
+// with:
+// Subject: Re: [boost] [optional] memory use for optional refs and ptrs
+// From: Rutger ter Borg (rutger_at_[hidden])
+// Date: 2010-10-06 14:33:43
+//
+#include <boost/composite_storage/layout/operators_all_of_aligned.hpp>
+#include <boost/mpl/package.hpp>
+#include <boost/mpl/fold_assoc_seq.hpp>
+
+#include <boost/mpl/size.hpp>
+#include <boost/mpl/for_each.hpp>
+#include <iostream>
+
+namespace boost
+{
+namespace composite_storage
+{
+namespace layout
+{
+ template
+ < typename Pack
+ >
+struct size_align_all
+;
+ template
+ < typename... T
+ >
+struct size_align_all
+ < mpl::package<T...>
+ >
+{
+ typedef
+ mpl::package
+ < typename components_aligned_yes::layout_of<T>...
+ >
+ type
+ ;
+};
+
+struct print_layout_one
+{
+ template
+ < std::size_t Size
+ , std::size_t Align
+ >
+ void
+ operator()(typename components_aligned_yes::template layout_data<Size,Align>)
+ {
+ std::cout<<"( size="<<Size<<", align="<<Align<<")\n";
+ }
+};
+
+ template
+ < typename Pack
+ >
+struct layout_all
+;
+ template
+ < typename... T
+ >
+struct layout_all
+ < mpl::package<T...>
+ >
+{
+ typedef
+ typename size_align_all<mpl::package<T...> >::type
+ layouts
+ ;
+ typedef
+ components_aligned_yes::layout_data<>
+ layout0
+ ;
+ typedef
+ typename mpl::fold_assoc_seq
+ < mpl::assoc_left
+ , operators<tags::all_of_aligned>::template
+ compose_layout
+ < mpl::arg<1>
+ , mpl::arg<2>
+ >
+ , layout0
+ , layouts
+ >::type
+ type
+ ;
+};
+
+struct print_layout_all
+{
+ std::size_t
+ padding_all
+ ;
+ print_layout_all(void)
+ : padding_all(0)
+ {}
+ typedef
+ components_aligned_yes::layout_data<>
+ layout0
+ ;
+ void
+ operator()(layout0)
+ {
+ std::cout<<"layout0"
+ <<"\n< size="<<layout0::size
+ <<"\n, align="<<layout0::align
+ <<"\n>\n";
+ padding_all=0;
+ }
+ template
+ < typename HeadComposed
+ , typename TailLayout
+ >
+ void
+ operator()
+ ( operators<tags::all_of_aligned>::template
+ compose_layout
+ < HeadComposed
+ , TailLayout
+ >
+ )
+ {
+ typedef
+ operators<tags::all_of_aligned>::template
+ compose_layout
+ < HeadComposed
+ , TailLayout
+ >
+ composition
+ ;
+ std::cout<<"composition"
+ <<"\n< offset="<<composition::offset
+ <<"\n, size="<<composition::size
+ <<"\n, align="<<composition::align
+ <<"\n>\n";
+ std::size_t const padding_one=composition::offset-HeadComposed::size;
+ std::cout<<"padding_one="<<padding_one<<"\n";
+ padding_all+=padding_one;
+ std::cout<<"padding_all="<<padding_all<<"\n";
+ HeadComposed head;
+ this->operator()(head);
+ }
+};
+
+ template
+ < typename Pack
+ >
+ void
+show_layout(char const*title)
+{
+ std::cout<<title<<"\n";
+ std::cout<<"===========\n";
+ typedef
+ typename size_align_all<Pack>::type
+ size_align_result;
+ print_layout_one plo;
+ boost::mpl::for_each<size_align_result>(plo);
+ typedef
+ typename layout_all<Pack>::type
+ layout_result;
+ print_layout_all pla;
+ pla(layout_result());
+}
+
+}//exit layout namespace
+}//exit composite_storage namespace
+}//exit boost namespace
+
+using namespace boost::composite_storage::layout;
+
+int main(void)
+{
+ struct tagPs
+ {
+ char c;
+ short s;
+ char d;
+ short t;
+ };
+ std::cout<<"sizeof(tagPs)="<<sizeof(tagPs)<<"\n";
+ show_layout<boost::mpl::package<char,short,char,short> >("tagPs");
+ struct Ptags
+ {
+ short s;
+ char c;
+ short t;
+ char d;
+ };
+ std::cout<<"sizeof(Ptags)="<<sizeof(Ptags)<<"\n";
+ show_layout<boost::mpl::package<short,char,short,char> >("Ptags");
+ return 0;
+}