46 lines
958 B
C++
46 lines
958 B
C++
// Copyright (C) 2016-2018 T. Zachary Laine
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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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//[ calc2a
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#include <boost/yap/expression.hpp>
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#include <iostream>
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int main ()
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{
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using namespace boost::yap::literals;
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auto expr_1 = 1_p + 2.0;
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auto expr_1_fn = [expr_1](auto &&... args) {
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return evaluate(expr_1, args...);
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};
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auto expr_2 = 1_p * 2_p;
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auto expr_2_fn = [expr_2](auto &&... args) {
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return evaluate(expr_2, args...);
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};
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auto expr_3 = (1_p - 2_p) / 2_p;
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auto expr_3_fn = [expr_3](auto &&... args) {
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return evaluate(expr_3, args...);
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};
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// Displays "5"
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std::cout << expr_1_fn(3.0) << std::endl;
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// Displays "6"
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std::cout << expr_2_fn(3.0, 2.0) << std::endl;
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// Displays "0.5"
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std::cout << expr_3_fn(3.0, 2.0) << std::endl;
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return 0;
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}
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//]
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