a7f49a2585
* rename swig files .i in .swig * update constraint_solver and routing * backport math_opt changes * move dynamic loading to ortools/third_party_solvers
121 lines
3.7 KiB
C++
121 lines
3.7 KiB
C++
// Copyright 2010-2025 Google LLC
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef OR_TOOLS_BASE_DYNAMIC_LIBRARY_H_
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#define OR_TOOLS_BASE_DYNAMIC_LIBRARY_H_
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#include <functional>
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#include <string>
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#include "absl/strings/string_view.h"
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#include "ortools/base/logging.h"
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#if defined(_MSC_VER)
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#define WIN32_LEAN_AND_MEAN // disables several conflicting macros
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#include <windows.h>
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#elif defined(__MINGW32__) || defined(__MINGW64__)
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#include <windows.h>
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#elif defined(__GNUC__)
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#include <dlfcn.h>
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#endif
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class DynamicLibrary {
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public:
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DynamicLibrary() : library_handle_(nullptr) {}
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~DynamicLibrary() {
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if (library_handle_ == nullptr) {
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return;
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}
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#if defined(_MSC_VER) || defined(__MINGW32__) || defined(__MINGW64__)
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FreeLibrary(static_cast<HINSTANCE>(library_handle_));
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#elif defined(__GNUC__)
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dlclose(library_handle_);
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#endif
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}
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bool TryToLoad(const absl::string_view library_name) {
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library_name_ = library_name;
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#if defined(_MSC_VER) || defined(__MINGW32__) || defined(__MINGW64__)
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library_handle_ = static_cast<void*>(LoadLibraryA(library_name_.c_str()));
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#elif defined(__GNUC__)
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library_handle_ = dlopen(library_name_.c_str(), RTLD_NOW);
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#endif
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return library_handle_ != nullptr;
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}
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bool LibraryIsLoaded() const { return library_handle_ != nullptr; }
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template <typename T>
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std::function<T> GetFunction(const char* function_name) {
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#if defined(_MSC_VER) || defined(__MINGW32__) || defined(__MINGW64__)
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// On Windows, avoid casting to void*: not supported by MinGW.
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FARPROC function_address =
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GetProcAddress(static_cast<HINSTANCE>(library_handle_), function_name);
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#else // Not Windows.
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const void* function_address = dlsym(library_handle_, function_name);
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#endif // MinGW.
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CHECK(function_address)
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<< "Error: could not find function " << std::string(function_name)
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<< " in " << library_name_;
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return TypeParser<T>::CreateFunction(function_address);
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}
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template <typename T>
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std::function<T> GetFunction(const std::string& function_name) {
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return GetFunction<T>(function_name.c_str());
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}
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template <typename T>
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void GetFunction(std::function<T>* function, const char* function_name) {
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*function = GetFunction<T>(function_name);
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}
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template <typename T>
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void GetFunction(std::function<T>* function,
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const std::string function_name) {
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GetFunction<T>(function, function_name.c_str());
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}
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private:
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void* library_handle_ = nullptr;
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std::string library_name_;
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template <typename T>
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struct TypeParser {};
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template <typename Ret, typename... Args>
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struct TypeParser<Ret(Args...)> {
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#if defined(_MSC_VER) || defined(__MINGW32__) || defined(__MINGW64__)
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// Windows: take a FARPROC as argument.
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static std::function<Ret(Args...)> CreateFunction(
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const FARPROC function_address) {
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return std::function<Ret(Args...)>(
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reinterpret_cast<Ret (*)(Args...)>(function_address));
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}
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#else
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// Not Windows: take a void* as argument.
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static std::function<Ret(Args...)> CreateFunction(
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const void* function_address) {
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return std::function<Ret(Args...)>(reinterpret_cast<Ret (*)(Args...)>(
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const_cast<void*>(function_address)));
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}
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#endif
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};
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};
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#endif // OR_TOOLS_BASE_DYNAMIC_LIBRARY_H_
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