nrg_util.h

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/*
  LibNRG - Networking for Real-time Games
  
  Copyright (C) 2012-2014 Alex Baines <alex@abaines.me.uk>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/
#ifndef NRG_UTIL_H
#define NRG_UTIL_H
#include "nrg_core.h"
#include <vector>
#include <algorithm>
#include <functional>
#include <memory>
#include <utility>

namespace nrg {

template< class T, class... Args >
std::unique_ptr<T> make_unique( Args&&... args ){
    return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
}

template<class ID>
class IDAssigner {
public:
    IDAssigner(const ID& start = 0) : max_id(start){}
    ID acquire(){
        if(reusable_ids.empty()){
            return max_id++;
        } else {
            ID id = reusable_ids.back();
            reusable_ids.pop_back();
            return id;
        }
    }
    void release(const ID& id){
        reusable_ids.push_back(id);
        std::sort(reusable_ids.begin(), reusable_ids.end(), std::greater<ID>());
    }
private:
    std::vector<ID> reusable_ids;
    ID max_id;
};

struct ClientStats {

    virtual size_t getNumSnapshotStats() const = 0;
    
    virtual int getSnapshotStat(size_t index) const = 0;
    
    virtual size_t getNumInterpStats() const = 0;
    
    virtual float getInterpStat(size_t index) const = 0;
    
    virtual uint8_t* toRGBATexture(uint32_t (&tex)[64*64]) const = 0;

    virtual ~ClientStats(){}
};

namespace detail {

template<size_t N>
struct min_sizeof {
    static const size_t val 
        = (N < 256U)        ? 1 // pow(2,8)
        : (N < 65536U)      ? 2 // pow(2,16)
        : (N < 4294967296U) ? 4 // pow(2,32)
        : 8
        ;
};

template<int N> struct size2type {};
template<>      struct size2type<1> { typedef uint8_t  type;};
template<>      struct size2type<2> { typedef uint16_t type;};
template<>      struct size2type<4> { typedef uint32_t type;};
template<>      struct size2type<8> { typedef uint64_t type;};

}

}

#endif