73ef4ff3
 Hu Chunming
提交三方库
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// Copyright (C) 2016-2018 T. Zachary Laine
//
// 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)
#include <boost/yap/expression.hpp>
#include <boost/mpl/assert.hpp>
#include <boost/core/lightweight_test.hpp>
#include <sstream>
template<typename T>
using term = boost::yap::terminal<boost::yap::expression, T>;
template<typename T>
using term_ref = boost::yap::expression_ref<boost::yap::expression, term<T> &>;
template<typename T>
using term_cref =
boost::yap::expression_ref<boost::yap::expression, term<T> const &>;
namespace yap = boost::yap;
namespace bh = boost::hana;
struct void_callable
{
void operator()() { *called_ = (*call_count_)++; }
int * call_count_;
int * called_;
};
struct int_callable
{
int operator()()
{
*called_ = (*call_count_)++;
return 42;
}
int * call_count_;
int * called_;
};
struct double_callable
{
double operator()()
{
*called_ = (*call_count_)++;
return 13.0;
}
int * call_count_;
int * called_;
};
int main()
{
{
{
int call_count = 0;
int int_called = -1;
int double_called = -1;
auto int_double_expr =
(term<int_callable>{{&call_count, &int_called}}(),
term<double_callable>{{&call_count, &double_called}}());
BOOST_TEST(evaluate(int_double_expr) == 13.0);
BOOST_TEST(int_called == 0);
BOOST_TEST(double_called == 1);
}
{
int call_count = 0;
int int_called = -1;
int double_called = -1;
auto double_int_expr =
(term<double_callable>{{&call_count, &double_called}}(),
term<int_callable>{{&call_count, &int_called}}());
BOOST_TEST(evaluate(double_int_expr) == 42);
BOOST_TEST(int_called == 1);
BOOST_TEST(double_called == 0);
}
}
{
{
int call_count = 0;
int void_called = -1;
int int_called = -1;
auto void_int_expr =
(term<void_callable>{{&call_count, &void_called}}(),
term<int_callable>{{&call_count, &int_called}}());
BOOST_TEST(evaluate(void_int_expr) == 42);
BOOST_TEST(void_called == 0);
BOOST_TEST(int_called == 1);
}
{
int call_count = 0;
int void_called = -1;
int int_called = -1;
auto int_void_expr =
(term<int_callable>{{&call_count, &int_called}}(),
term<void_callable>{{&call_count, &void_called}}());
using eval_type = decltype(evaluate(int_void_expr));
BOOST_MPL_ASSERT(
(std::is_same<void, eval_type>));
evaluate(int_void_expr);
BOOST_TEST(void_called == 1);
BOOST_TEST(int_called == 0);
}
}
return boost::report_errors();
}
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