local_function/test/return_this.cpp

// Copyright (C) 2009-2012 Lorenzo Caminiti
// Distributed under the Boost Software License, Version 1.0
// (see accompanying file LICENSE_1_0.txt or a copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Home at http://www.boost.org/libs/local_function

#include <boost/config.hpp>
#ifndef BOOST_NO_VARIADIC_MACROS

#include <boost/local_function.hpp>
#include <boost/function.hpp>
#define BOOST_TEST_MODULE TestReturnThis
#include <boost/test/unit_test.hpp>

struct number {
    number(int value) : value_(value) {}

    boost::function<int (void)> inc(void) {
        int BOOST_LOCAL_FUNCTION(bind this_) {
            return ++this_->value_;
        } BOOST_LOCAL_FUNCTION_NAME(i)
        return i;
    }

private:
    int value_;
};

BOOST_AUTO_TEST_CASE(test_return_this) {
    number n1 = 0; // Object valid in scope where closure is used.
    boost::function<int (void)> inc1 = n1.inc();
    number n2 = 0;
    boost::function<int (void)> inc2 = n2.inc();

    BOOST_CHECK(inc1() == 1);
    BOOST_CHECK(inc1() == 2);
    BOOST_CHECK(inc2() == 1);
    BOOST_CHECK(inc1() == 3);
}

#else

int main(void) { return 0; } // Trivial test.

#endif