UE4中使用Boost库

适用于header-only的库。



由于ProxyLODPlugin中已经包含了大部分的Boost库，因此只需要把相关路径加进去就行了。如果所需要的库没有，那么手动加入到项目路径中也可以。



Include Path



在项目的Build.cs中添加如下内容



PublicIncludePaths.AddRange(
	new string[] {
		System.IO.Path.Combine(EngineDirectory, "Plugins/Experimental/ProxyLODPlugin/Source/ThirdParty")
		// ... add public include paths required here ...
	}
	);



如果上面文件夹中的库缺失，将缺失的库拷贝到项目文件夹中，比如Source文件夹下面建个ThirdParty，然后这个目录添加到IncludePath中。



System.IO.Path.Combine(ModuleDirectory,"../ThirdParty")



头文件



THIRD_PARTY_INCLUDES_START
#define BOOST_DISABLE_ABI_HEADERS
#include "boost/graph/graph_traits.hpp"
#include "boost/graph/adjacency_list.hpp"
#include "boost/graph/dijkstra_shortest_paths.hpp"
#include "boost/property_map/property_map.hpp"
THIRD_PARTY_INCLUDES_END



THIRD_PARTY_INCLUDES_START和END宏解决下面的错误



Source\ThirdParty\boost/type_traits/detail/config.hpp(85): error C4668: ‘__clang_major___WORKAROUND_GUARD‘ is not defined as a preprocessor macro, replacing with ‘0‘ for ‘#if/#elif‘
Source\ThirdParty\boost/type_traits/detail/config.hpp(85): error C4668: ‘__clang_major__‘ is not defined as a preprocessor macro, replacing with ‘0‘ for ‘#if/#elif‘
1>C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\shared\ntverp.h(119): error C4668: ‘DBG‘ is not defined as a preprocessor macro, replacing with ‘0‘ for ‘#if/#elif‘
1>C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\shared\ntverp.h(126): error C4668: ‘BETA‘ is not defined as a preprocessor macro, replacing with ‘0‘ for ‘#if/#elif‘
Source\ThirdParty\boost/smart_ptr/shared_ptr.hpp(833): error C4668: ‘__GNUC__‘ is not defined as a preprocessor macro, replacing with ‘0‘ for ‘#if/#elif‘
Source\ThirdParty\boost/mpl/aux_/config/operators.hpp(27): error C4668: ‘__NVCC___WORKAROUND_GUARD‘ is not defined as a preprocessor macro, replacing with ‘0‘ for ‘#if/#elif‘
Source\ThirdParty\boost/mpl/aux_/config/operators.hpp(27): error C4668: ‘__NVCC__‘ is not defined as a preprocessor macro, replacing with ‘0‘ for ‘#if/#elif‘



BOOST_DISABLE_ABI_HEADERS解决下面的错误



Source\ThirdParty\boost/config/abi_prefix.hpp(19): error C4103: alignment changed after including header, may be due to missing #pragma pack(pop)
Source\ThirdParty\boost/archive/detail/abi_prefix.hpp(11): error C4103: alignment changed after including header, may be due to missing #pragma pack(pop)
Source\ThirdParty\boost/archive/archive_exception.hpp(34): error C4103: alignment changed after including header, may be due to missing #pragma pack(pop)
Source\ThirdParty\boost/config/abi_suffix.hpp(20): error C4103: alignment changed after including header, may be due to missing #pragma pack(pop)
Source\ThirdParty\boost/archive/detail/abi_suffix.hpp(14): error C4103: alignment changed after including header, may be due to missing #pragma pack(pop)
Source\ThirdParty\boost/archive/archive_exception.hpp(98): error C4103: alignment changed after including header, may be due to missing #pragma pack(pop)



由于UE4默认禁用C++ exception，所以可能需要加上下面的代码



namespace boost
{
#ifdef BOOST_NO_EXCEPTIONS

	void throw_exception(std::exception const& e) {} // user defined

#else

#endif
} // namespace boost



否则可能会得到下面的错误



error LNK2019: unresolved external symbol "void __cdecl boost::throw_exception(class stdext::exception const &)" (?throw_exception@boost@@YAXAEBVexception@stdext@@@Z)



注



个人测试，1.69版本的和UE4.22，4.23编译通过，1.71版本的编译有问题，VS2019环境。
Boost有条件的还是不要用了，一个是代码写得像天书，不够友好，另一个是有时候只用到一个库却要引入Boost全家桶套餐。

UE4中使用Boost库

原文：https://www.cnblogs.com/haisong1991/p/11496406.html