问题
I'm using MinGW 4.5.1 for compiling a client application (C++, Windows XP) utilizing the newest version of Boost 1_47. For some reason that I can't seem to determine, when I go to compile using the boost::asio::signal_set type I get a compile error (boost::asio::signal_set does not define a type), and when trying to explicitly include either of the associated signal_set headers, I get complaints of no file can be found (despite the file indeed being where expected). I have tried including files within the same level of the directory tree without issue, it only seems to hang on the signal_set.hpp file (although no complaints when using the full header asio.hpp which has it as an include). I get the same behavior when trying to use boost 1_46_1 as well.
Might anyone have any insights as to what is going on?
回答1:
The issue I had was that I was not properly including the boost headers as I thought I was. Usually I have the boost installation in some directory on the hard drive, say C:\Boost\some_boost_version. Whereas I thought I was pointing to the new boost version's includes at C:\Boost\boost-1_47\boost, there was not a level inside the directory tree for \boost, everything was in C:\Boost\boost-1_47. By adding a new directory (created C:\Boost\boost-1_47\boost) and putting the includes within that, my problem was resolved. Something I overlooked when I retooled my build scripts for build the boost libraries on my machine.
来源：https://stackoverflow.com/questions/6764611/cannot-compile-when-trying-to-utilize-boostasiosignal-set