author | hgs |
Tue, 20 Jul 2010 16:35:53 +0530 | |
changeset 44 | 97b0fb8a2cc2 |
parent 0 | e4d67989cc36 |
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//----------------------------------------------------------------------------- |
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// boost-libs variant/libs/test/jobs.h header file |
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// See http://www.boost.org for updates, documentation, and revision history. |
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//----------------------------------------------------------------------------- |
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// |
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// Copyright (c) 2003 |
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// Eric Friedman, Itay Maman |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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#ifndef _JOBSH_INC_ |
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#define _JOBSH_INC_ |
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#include <algorithm> |
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#include <iostream> |
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#include <sstream> |
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#include <string> |
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#include <typeinfo> |
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#include <vector> |
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#include "boost/variant/variant_fwd.hpp" |
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#include "boost/variant/get.hpp" |
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#include "boost/variant/apply_visitor.hpp" |
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#include "boost/variant/static_visitor.hpp" |
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#include "boost/detail/workaround.hpp" |
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#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x0551)) |
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# pragma warn -lvc |
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#endif |
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struct to_text : boost::static_visitor<std::string> |
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{ |
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private: // NO_FUNCTION_TEMPLATE_ORDERING workaround |
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template < BOOST_VARIANT_ENUM_PARAMS(typename U) > |
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std::string to_text_impl( |
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const boost::variant< BOOST_VARIANT_ENUM_PARAMS(U) >& operand, long |
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) const |
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{ |
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std::ostringstream ost; |
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ost << "[V] " << boost::apply_visitor(to_text(), operand); |
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return ost.str(); |
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} |
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template <typename Value> |
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std::string to_text_impl(const Value& operand, int) const |
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{ |
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std::ostringstream ost; |
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ost << "[V] " << operand; |
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return ost.str(); |
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} |
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public: |
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template <typename T> |
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std::string operator()(const T& operand) const |
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{ |
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return to_text_impl(operand, 1L); |
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} |
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}; |
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struct total_sizeof : boost::static_visitor<int> |
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{ |
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total_sizeof() : total_(0) { } |
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template<class Value> |
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int operator()(const Value&) const |
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{ |
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total_ += sizeof(Value); |
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return total_; |
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} |
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int result() const |
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{ |
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return total_; |
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} |
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mutable int total_; |
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}; // total_sizeof |
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//Function object: sum_int |
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//Description: Compute total sum of a series of numbers, (when called successively) |
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//Use sizeof(T) if applied with a non-integral type |
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struct sum_int : boost::static_visitor<int> |
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{ |
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sum_int() : total_(0) { } |
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template<int n> |
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struct int_to_type |
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{ |
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BOOST_STATIC_CONSTANT(int, value = n); |
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}; |
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//Integral type - add numerical value |
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template<typename T> |
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void add(T t, int_to_type<true> ) const |
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{ |
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total_ += t; |
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} |
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//Other types - add sizeof<T> |
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template<typename T> |
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void add(T& , int_to_type<false> ) const |
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{ |
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total_ += sizeof(T); |
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} |
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template<typename T> |
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int operator()(const T& t) const |
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{ |
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//Int_to_type is used to select the correct add() overload |
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add(t, int_to_type<boost::is_integral<T>::value>()); |
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return total_; |
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} |
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int result() const |
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{ |
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return total_; |
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} |
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private: |
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mutable int total_; |
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}; //sum_int |
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//Function object: sum_double |
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//Description: Compute total sum of a series of numbers, (when called successively) |
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//Accpetable input types: float, double (Other types are silently ignored) |
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struct sum_double : boost::static_visitor<double> |
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{ |
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sum_double() : total_(0) { } |
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void operator()(float value) const |
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{ |
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total_ += value; |
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} |
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void operator()(double value) const |
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{ |
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total_ += value; |
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} |
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template<typename T> |
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void operator()(const T&) const |
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{ |
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//Do nothing |
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} |
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double result() const |
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{ |
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return total_; |
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} |
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|
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private: |
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mutable double total_; |
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}; //sum_double |
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struct int_printer : boost::static_visitor<std::string> |
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{ |
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int_printer(std::string prefix_s = "") : prefix_s_(prefix_s) { } |
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int_printer(const int_printer& other) : prefix_s_(other.prefix_s_) |
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{ |
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ost_ << other.str(); |
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} |
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std::string operator()(int x) const |
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{ |
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ost_ << prefix_s_ << x; |
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return str(); |
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} |
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|
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std::string operator()(const std::vector<int>& x) const |
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{ |
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ost_ << prefix_s_; |
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//Use another Int_printer object for printing a list of all integers |
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int_printer job(","); |
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ost_ << std::for_each(x.begin(), x.end(), job).str(); |
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return str(); |
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} |
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std::string str() const |
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{ |
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return ost_.str(); |
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} |
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private: |
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std::string prefix_s_; |
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mutable std::ostringstream ost_; |
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}; //int_printer |
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struct int_adder : boost::static_visitor<> |
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{ |
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int_adder(int rhs) : rhs_(rhs) { } |
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result_type operator()(int& lhs) const |
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{ |
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lhs += rhs_; |
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} |
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template<typename T> |
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result_type operator()(const T& ) const |
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{ |
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//Do nothing |
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} |
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int rhs_; |
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}; //int_adder |
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struct held_type_name : boost::static_visitor<std::string> |
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{ |
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template<typename T> |
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std::string operator()(const T& ) const |
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{ |
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ost_ << '[' << typeid(T).name() << ']'; |
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return result(); |
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} |
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std::string result() const |
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{ |
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return ost_.str(); |
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} |
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mutable std::ostringstream ost_; |
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}; //held_type_name |
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template<typename T> |
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struct spec |
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{ |
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typedef T result; |
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}; |
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template<typename VariantType, typename S> |
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inline void verify(VariantType& var, spec<S>, std::string str = "") |
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{ |
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const VariantType& cvar = var; |
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BOOST_CHECK(boost::apply_visitor(total_sizeof(), cvar) == sizeof(S)); |
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BOOST_CHECK(cvar.type() == typeid(S)); |
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// |
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// Check get<>() |
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// |
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BOOST_CHECK(boost::get<S>(&var)); |
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BOOST_CHECK(boost::get<S>(&cvar)); |
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const S* ptr1 = 0; |
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const S* ptr2 = 0; |
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try |
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{ |
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S& r = boost::get<S>(var); |
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ptr1 = &r; |
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} |
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catch(boost::bad_get& ) |
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{ |
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BOOST_ERROR( "get<S> failed unexpectedly" ); |
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} |
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try |
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{ |
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const S& cr = boost::get<S>(cvar); |
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ptr2 = &cr; |
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} |
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catch(boost::bad_get& ) |
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{ |
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BOOST_ERROR( "get<S> const failed unexpectedly" ); |
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} |
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|
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BOOST_CHECK(ptr1 != 0 && ptr2 == ptr1); |
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// |
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// Check string content |
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// |
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if(str.length() > 0) |
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{ |
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std::string temp = boost::apply_visitor(to_text(), cvar); |
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std::cout << "temp = " << temp << ", str = " << str << std::endl; |
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BOOST_CHECK(temp == str); |
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} |
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} |
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template<typename VariantType, typename S> |
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inline void verify_not(VariantType& var, spec<S>) |
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{ |
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const VariantType& cvar = var; |
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BOOST_CHECK(cvar.type() != typeid(S)); |
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// |
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// Check get<>() |
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// |
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BOOST_CHECK(!boost::get<S>(&var)); |
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BOOST_CHECK(!boost::get<S>(&cvar)); |
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const S* ptr1 = 0; |
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const S* ptr2 = 0; |
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try |
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{ |
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S& r = boost::get<S>(var); // should throw |
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BOOST_ERROR( "get<S> passed unexpectedly" ); |
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ptr1 = &r; |
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} |
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catch(boost::bad_get& ) |
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{ |
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// do nothing except pass-through |
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} |
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try |
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{ |
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const S& cr = boost::get<S>(var); // should throw |
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BOOST_ERROR( "get<S> const passed unexpectedly" ); |
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ptr2 = &cr; |
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} |
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catch(boost::bad_get& ) |
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{ |
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// do nothing except pass-through |
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} |
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BOOST_CHECK(ptr1 == 0 && ptr2 == 0); |
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} |
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#endif //_JOBSH_INC_ |