src/main/decaf/util/Random.h

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef _DECAF_UTIL_RANDOM_H_
#define _DECAF_UTIL_RANDOM_H_

#include <decaf/lang/exceptions/IllegalArgumentException.h>
#include <decaf/util/Config.h>
#include <vector>
#include <cmath>

namespace decaf{
namespace util{

    class DECAF_API Random {
    private:

        static unsigned long long multiplier;

        bool haveNextNextGaussian;

        unsigned long long seed;

        double nextNextGaussian;

    public:

        Random();

        Random( unsigned long long seed );

        virtual ~Random();

    public:

        bool nextBoolean();

        double nextDouble();

        float nextFloat();

        double nextGaussian();

        int nextInt();

        int nextInt( int n );

        long long nextLong();

    public:  // Virtual Methods

        virtual void nextBytes( std::vector<unsigned char>& buf );

        virtual void nextBytes( unsigned char* buf, int size );

        virtual void setSeed( unsigned long long seed );

    protected:  // Virtual method used by all non-virtual methods in Random.

        virtual int next( int bits );

    };

}}

#endif /*_DECAF_UTIL_RANDOM_H_*/