具有Boost 1.50的Visual Studio C ++ 2005/2010：警告C4267

Question

I'm unable to prevent this warning..

...\boost\asio\impl\io_service.ipp(46) : warning C4267: 'argument' : conversion from 'size_t' to 'std::numeric_limits<unsigned int>::_Ty', possible loss of data

Perhaps you got

1. An explanation for this
2. The solution to prevent the throwing :-)

kindly,

alex

Answer 1

an explanation for this

Suspect this is a 64-bit build and size_t will be 64-bit and unsigned int will be 32-bit:

std::cout << sizeof(unsigned int) << "\n"; // Output '4' on both x86 and x64
std::cout << sizeof(size_t)       << "\n"; // Output '4' on x86
                                           // Output '8' on x64

the solution to prevent the throwing

Add the compiler flag /Wd4267 to disable this warning. However, that would disable the warning for all sources in your project which you may dislike. An alternative is to use #pragma warning :

#pragma warning(disable: 4267)
#include <boost-header-files>
#pragma warning(default: 4267)