QuantLib: a free/open-source library for quantitative finance
fully annotated source code - version 1.34
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piecewisefunction.hpp
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1/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2
3/*
4 Copyright (C) 2015 Peter Caspers
5
6 This file is part of QuantLib, a free-software/open-source library
7 for financial quantitative analysts and developers - http://quantlib.org/
8
9 QuantLib is free software: you can redistribute it and/or modify it
10 under the terms of the QuantLib license. You should have received a
11 copy of the license along with this program; if not, please email
12 <quantlib-dev@lists.sf.net>. The license is also available online at
13 <http://quantlib.org/license.shtml>.
14
15 This program is distributed in the hope that it will be useful, but WITHOUT
16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17 FOR A PARTICULAR PURPOSE. See the license for more details.
18*/
19
20/*! \file piecewisefunction.hpp
21 \brief utility macro for piecewise functions
22*/
23
24#ifndef quantlib_piecewise_function_hpp
25#define quantlib_piecewise_function_hpp
26
27#include <ql/qldefines.hpp>
28#include <algorithm>
29
30/*! This defines a piecewise constant function which is RCLL and takes
31 the values Y[0], Y[1], ... Y[n] on the intervals
32 (-\infty, X[0]), [ X[1], X[2] ), ... , [ X[n-1], \infty)
33 Normally Y.size() should be X.size() + 1. If more values for Y are
34 given, they are ignored. If less values are given the last given
35 value is kept the same for the remaining intervals.
36 If X.size() is 0 a constant function taking the value Y[0] is
37 evaluated.
38
39 \warning If Y.size() is 0, an invalid access occurs. This
40 condition is not checked for performance reasons.
41*/
42
43#define QL_PIECEWISE_FUNCTION(X, Y, x) \
44 Y[std::min<std::size_t>( \
45 std::upper_bound(X.begin(), X.end(), x) - X.begin(), Y.size() - 1)]
46
47#endif
Global definitions and compiler switches.