policy_eg_3.cpp

来自「Boost provides free peer-reviewed portab」· C++ 代码 · 共 43 行

//  Copyright John Maddock 2007.
//  Copyright Paul A. Bristow 2007.

//  Use, modification and distribution are subject to 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)

#ifdef _MSC_VER
# pragma warning (disable : 4305) // 'initializing' : truncation from 'long double' to 'const eval_type'
# pragma warning (disable : 4244) //  conversion from 'long double' to 'const eval_type'
#endif

#include <iostream>

//[policy_eg_3

#include <boost/math/distributions/binomial.hpp>

//
// Begin by defining a policy type, that gives the
// behaviour we want:
//
using namespace boost::math::policies;
typedef policy<
   promote_float<false>,
   discrete_quantile<integer_round_nearest>
> mypolicy;
//
// Then define a distribution that uses it:
//
typedef boost::math::binomial_distribution<float, mypolicy> mybinom;
//
//  And now use it to get the quantile:
//
int main()
{
   std::cout << "quantile is: " <<
      quantile(mybinom(200, 0.25), 0.05) << std::endl;
}

//]