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C++形式の動的リンク・ライブラリの書き方(msvc編)の付録
project(Test)
add_library(sub SHARED sub.cpp dll.h)
add_executable(main main.cpp dll.h)
target_link_libraries(main sub)
#if !defined(DLL_H)
#define DLL_H
#ifdef DLL_BODY
#define DLL_EXPORT __declspec(dllexport)
#else
#define DLL_EXPORT __declspec(dllimport)
#endif
// privateメンバがないのでC4251警告が出ない
class Foo0
{
public:
int mData;
};
// privateメンバがあるC4251警告が出るが、特に危険なクラスではない
class Foo1
{
int mData;
};
// privateメンバがないのでC4251警告が出ないが、危険なクラスである!!
class /*DLL_EXPORT*/ Bar
{
static int& getStaticInt()
{
static int sStaticInt=1;
return sStaticInt;
}
public:
void set(int x) { getStaticInt()=x; }
int get() { return getStaticInt(); }
};
#include <vector>
namespace std
{
struct DLL_EXPORT _Container_base12;
template class DLL_EXPORT _Vector_val<std::_Simple_types<int>>;
template class DLL_EXPORT _Compressed_pair<std::_Wrap_alloc<std::allocator<int>>,std::_Vector_val<std::_Simple_types<int>>,true>;
template class DLL_EXPORT _Vector_alloc<std::_Vec_base_types<int,std::allocator<int>>>;
template class DLL_EXPORT _Vector_alloc<std::_Vec_base_types<int,allocator<int>>>;
template class DLL_EXPORT vector<int,allocator<int>>;
}
// exportされたクラス
class DLL_EXPORT Baz
{
public:
Foo0 mFoo0;
Foo1 mFoo1; // C4251警告
Bar mBar;
void set(int x) { mBar.set(x); }
int get() { return mBar.get(); }
std::vector<int> mVector;
};
//extern thread_local int DLL_EXPORT gGlobalInt;
DLL_EXPORT int& getGlobalInt();
#endif // DLL_H
#include <iostream>
#include "dll.h"
int main(int argc, char* argv[])
{
Bar aBar;
Baz aBaz;
std::cout << "aBar.get()=" << aBar.get() << "\n";
std::cout << "aBaz.get()=" << aBaz.get() << "\n";
aBar.set(10);
aBaz.set(20);
std::cout << "aBar.get()=" << aBar.get() << "\n";
std::cout << "aBaz.get()=" << aBaz.get() << "\n";
return 0;
}
#define DLL_BODY
#include "dll.h"
thread_local int gGlobalInt=0;
int& getGlobalInt()
{
return gGlobalInt;
}
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