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#ifndef QPID_SYS_SHLIB_H
#define QPID_SYS_SHLIB_H
/*
*
* 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.
*
*/
#include "qpid/CommonImportExport.h"
#include <boost/noncopyable.hpp>
#include <iostream>
namespace qpid {
namespace sys {
/** Encapsulates a shared library handle.
*@see AutoShlib
*/
class Shlib {
public:
/** Load a shared library */
Shlib(const char* libname) { load(libname); }
/** Load a shared library */
Shlib(const std::string& libname) { load(libname.c_str()); }
/** Unload shared library. */
QPID_COMMON_EXTERN void unload();
/** Look up symbol. */
QPID_COMMON_EXTERN void* getSymbol(const char* symbol);
/** Look up symbol in shared library, cast it to the desired
* pointer type, void* by default.
*/
template <class T>
T getSymbol(const char* symbol) {
// Double cast avoids warning about casting object to function pointer
return reinterpret_cast<T>(reinterpret_cast<intptr_t>(
this->getSymbol(symbol)));
}
private:
void* handle;
QPID_COMMON_EXTERN void load(const char* libname);
};
/** A shared library handle that unloads the shlib in it's dtor */
class AutoShlib : public Shlib {
public:
/** Load shared library */
AutoShlib(const std::string& libname) : Shlib(libname) {}
/** Calls unload() */
QPID_COMMON_EXTERN ~AutoShlib() throw();
};
}} // namespace qpid::sys
#endif /*!QPID_SYS_SHLIB_H*/
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