提升 mpi x64 警告"size_t to int"

Boost mpi x64 warning "size_t to int"

本文关键字：to int size x64 警告 提升 mpi      更新时间：2023-10-16

我已经成功地用mpi构建了Boost，但在x64平台下使用Boost mpi时收到了很多警告。我使用的是Boost 1.59.0+vs2015。请帮我摆脱这些警告

这是我的测试代码。

#include <boost/mpi/environment.hpp>
#include <boost/mpi/communicator.hpp>
#include <iostream>
namespace mpi = boost::mpi;
int main(int argc, char* argv[]) {
    mpi::environment env(argc, argv);
    mpi::communicator world;
    std::cout << "I am process " << world.rank() << " of " << world.size()
        << "." << std::endl;
    return 0;
}

其中一些警告看起来是这样的：

1>d:dependenciesboost_1_59_0boostmpidetailmpi_datatype_primitive.hpp(61) : warning C4267 : 'argument' : conversion from 'size_t' to 'int', possible loss of data
1>d:dependenciesboost_1_59_0boostmpidetailmpi_datatype_primitive.hpp(80) : warning C4267 : 'argument' : conversion from 'size_t' to 'int', possible loss of data
1>d:dependenciesboost_1_59_0boostmpidetailpacked_iprimitive.hpp(62) : warning C4267 : 'argument' : conversion from 'size_t' to 'int', possible loss of data
1>d:dependenciesboost_1_59_0boostmpidetailpacked_iprimitive.hpp(106) : warning C4267 : 'argument' : conversion from 'size_t' to 'int', possible loss of data
1>d:dependenciesboost_1_59_0boostmpidetailbinary_buffer_iprimitive.hpp(64) : warning C4267 : 'argument' : conversion from 'size_t' to 'int', possible loss of data
1>d:dependenciesboost_1_59_0boostmpidetailpacked_oprimitive.hpp(52) : warning C4267 : 'argument' : conversion from 'size_t' to 'int', possible loss of data
1>d:dependenciesboost_1_59_0boostmpidetailpacked_oprimitive.hpp(96) : warning C4267 : “初始化” : conversion from 'size_t' to 'int', possible loss of data
1>d:dependenciesboost_1_59_0boostmpidetailpacked_oprimitive.hpp(100) : warning C4267 : 'argument' : conversion from 'size_t' to 'int', possible loss of data
1>d:dependenciesboost_1_59_0boostmpidetailbinary_buffer_oprimitive.hpp(53) : warning C4267 : 'argument' : conversion from 'size_t' to 'int', possible loss of data
1>d:dependenciesboost_1_59_0boostmpidetailbinary_buffer_oprimitive.hpp(87) : warning C4267 : 'argument' : conversion from 'size_t' to 'int', possible loss of data
1>  d:dependenciesboost_1_59_0boostarchivedetailoserializer.hpp(88) : note : see reference to function template instantiation'void boost::mpi::binary_buffer_oprimitive::save<char>(const std::basic_string<char, std::char_traits<char>, std::allocator<char>> &)'
1>  d:dependenciesboost_1_59_0boostarchivedetailoserializer.hpp(232) : note : see reference to function template instantiation 'void boost::archive::save_access::save_primitive<Archive, T>(Archive &, const T &)'
1>          with
1>[
1>              Archive = boost::mpi::packed_oarchive,
1>              T = std::string
1>]

IMHO MSVC C4267警告过于敏感。它甚至在将int转换为double时弹出。然而，正如@sjsam所评论的，在这种情况下，它可能是有效的。

当我确信转换是有效的时，我经常使用本地禁用警告：

#ifdef _MSC_VER
#pragma warning( push )
#pragma warning( disable : 4244 ) // implicit conversion, possible loss of data
#endif

在代码之前，并使用重新启用

#ifdef _MSC_VER
#pragma warning( pop )
#endif

如果您确信boost::mpi值永远不会超过std::numeric_limits<int>::max()，则将它们放在周围：

#include <boost/mpi/environment.hpp>
#include <boost/mpi/communicator.hpp>

因此您可以仅针对boost::mpi禁用C4267警告。

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