Precompiled.h

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/*
    This file is part of cpp-ethereum.
 
    cpp-ethereum is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    cpp-ethereum is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
 
#include <unordered_map>
#include <functional>
#include <libdevcore/CommonData.h>
#include <libdevcore/Exceptions.h>
 
namespace dev
{
namespace eth
{
 
using PrecompiledExecutor = std::function<std::pair<bool, bytes>(bytesConstRef _in)>;
using PrecompiledPricer = std::function<bigint(bytesConstRef _in)>;
 
DEV_SIMPLE_EXCEPTION(ExecutorNotFound);
DEV_SIMPLE_EXCEPTION(PricerNotFound);
 
class PrecompiledRegistrar
{
public:
    static PrecompiledExecutor const& executor(std::string const& _name);
 
    static PrecompiledPricer const& pricer(std::string const& _name);
 
    static PrecompiledExecutor registerExecutor(std::string const& _name, PrecompiledExecutor const& _exec) { return (get()->m_execs[_name] = _exec); }
    static void unregisterExecutor(std::string const& _name) { get()->m_execs.erase(_name); }
 
    static PrecompiledPricer registerPricer(std::string const& _name, PrecompiledPricer const& _exec) { return (get()->m_pricers[_name] = _exec); }
    static void unregisterPricer(std::string const& _name) { get()->m_pricers.erase(_name); }
 
private:
    static PrecompiledRegistrar* get() { if (!s_this) s_this = new PrecompiledRegistrar; return s_this; }
 
    std::unordered_map<std::string, PrecompiledExecutor> m_execs;
    std::unordered_map<std::string, PrecompiledPricer> m_pricers;
    static PrecompiledRegistrar* s_this;
};
 
// TODO: unregister on unload with a static object.
#define ETH_REGISTER_PRECOMPILED(Name) static std::pair<bool, bytes> __eth_registerPrecompiledFunction ## Name(bytesConstRef _in); static PrecompiledExecutor __eth_registerPrecompiledFactory ## Name = ::dev::eth::PrecompiledRegistrar::registerExecutor(#Name, &__eth_registerPrecompiledFunction ## Name); static std::pair<bool, bytes> __eth_registerPrecompiledFunction ## Name
#define ETH_REGISTER_PRECOMPILED_PRICER(Name) static bigint __eth_registerPricerFunction ## Name(bytesConstRef _in); static PrecompiledPricer __eth_registerPricerFactory ## Name = ::dev::eth::PrecompiledRegistrar::registerPricer(#Name, &__eth_registerPricerFunction ## Name); static bigint __eth_registerPricerFunction ## Name
}
}