Jens Weller meetingcpp

meetingcpp / boostache_adapted_fusion_example.cpp

Created February 20, 2016 16:10

boostache example with boost fusion and adapted struct

	/**
	* \file boostache_adapted_fusion_example.cpp
	*
	* Copyright 2016 Jens Weller : meetingcpp.com
	*
	* Distributed under the Boost Software License, Version 1.0.
	*/
	#include <iostream>

	#include <boost/spirit/include/support_extended_variant.hpp>

meetingcpp / jsonimport.hpp

Created February 26, 2016 20:20

Generic JSON Import - this code is accessing json via the json:: namespace and forwarding the types to various visitors to filter/import

	template<class Import, class StringType = boost::string_ref>
	struct JsonVisitor
	{
	JsonVisitor(Import& import,const boost::dynamic_bitset& filterresult):import(import),key(key),filterresult(filterresult){}
	template<class Value>
	bool operator()(const Value& v)const
	{
	import.processKeyValue(current_key,v);
	return true;
	}

meetingcpp / qt.cmake

Created February 27, 2016 22:33

qt cmake (first try)

	cmake_minimum_required(VERSION 2.8.11)
	project(cmakeqttest)

	# Find includes in corresponding build directories
	set(CMAKE_INCLUDE_CURRENT_DIR ON)
	# Instruct CMake to run moc automatically when needed.
	set(CMAKE_AUTOMOC ON)
	set(CMAKE_AUTOUIC ON)

	if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")

meetingcpp / Selection by interface

Last active March 9, 2016 15:40

Example code for selecting by interface via enable_if/return type deduction

	#include <iostream>
	#include <type_traits>

	#include <boost/tti/has_member_function.hpp>
	#include <boost/function_types/result_type.hpp>

	struct Interface
	{
	std::string interface()const
	{

meetingcpp / tagtype.hpp

Last active March 17, 2018 18:39

TMP mp11 & boost::fusion Exercise...

	#include <boost/mp11.hpp>
	#include <boost/mp11/mpl.hpp>

	#include <boost/fusion/sequence/intrinsic/at_c.hpp>
	#include <boost/fusion/include/at.hpp>
	#include <boost/fusion/tuple/tuple.hpp>
	#include <boost/fusion/adapted/struct/adapt_struct.hpp>
	#include <boost/fusion/support/deduce_sequence.hpp>

	//#include <boost/fusion/adapted.hpp>

meetingcpp / adapted_member_names.cpp

Created March 18, 2018 14:42

Get member names of a fusion adapted struct with mp11

	template<class Seq>
	constexpr std::array<const char*,boost::fusion::result_of::size<Seq>::value> get_member_names()
	{
	std::array<const char*,boost::fusion::result_of::size<Seq>::value> members{};
	boost::mp11::mp_for_each< boost::mp11::mp_iota_c<boost::fusion::result_of::size<Seq>::value>>(
	[&]( auto I ){
	members[I]=boost::fusion::extension::struct_member_name<Seq,I>::call();
	} );
	return members;
	}

meetingcpp / fva.cpp

Created March 19, 2018 20:51

fusion visit & assign

	namespace detail{
	template <size_t I>
	struct fusion_visit_impl
	{
	template <typename Seq, typename F>
	static void visit(Seq& s, size_t idx, F&& fun)
	{
	static_assert(boost::fusion::result_of::size<Seq>::value >= I,"fusion index out of bounds");
	if (idx == I - 1) fun(boost::fusion::get<I - 1>(s));
	else fusion_visit_impl<I - 1>::visit(s, idx, std::forward<F>(fun));