File: phoenix_factorial_local.cpp

package info (click to toggle)
boost1.83 1.83.0-4.2
  • links: PTS, VCS
  • area: main
  • in suites: trixie
  • size: 545,456 kB
  • sloc: cpp: 3,857,086; xml: 125,552; ansic: 34,414; python: 25,887; asm: 5,276; sh: 4,799; ada: 1,681; makefile: 1,629; perl: 1,212; pascal: 1,139; sql: 810; yacc: 478; ruby: 102; lisp: 24; csh: 6
file content (31 lines) | stat: -rw-r--r-- 1,026 bytes parent folder | download | duplicates (15)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

// 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/local_function.hpp>
#include <boost/function.hpp>
#include <boost/phoenix/core.hpp>
#include <boost/phoenix/function.hpp>
#include <boost/detail/lightweight_test.hpp>

//[phoenix_factorial_local
int main(void) {
    using boost::phoenix::arg_names::arg1;
    
    int BOOST_LOCAL_FUNCTION(int n) { // Unfortunately, monomorphic.
        return (n <= 0) ? 1 : n * factorial_impl(n - 1);
    } BOOST_LOCAL_FUNCTION_NAME(recursive factorial_impl)

    boost::phoenix::function< boost::function<int (int)> >
            factorial(factorial_impl); // Phoenix function from local function.
    
    int i = 4;
    BOOST_TEST(factorial(i)() == 24);      // Call.
    BOOST_TEST(factorial(arg1)(i) == 24);  // Lazy call.
    return boost::report_errors();
}
//]