[英]cannot convert boost::lambda::… to long long unsigned int
我有一个使用boost 1.56标头的简单程序:
#include <boost/lambda/lambda.hpp>
#include <boost/lambda/bind.hpp>
#include <algorithm>
#include <iostream>
int main(int argc, char* args[])
{
size_t a[] = { 1, 2, 3, 4 };
size_t b[] = { 5, 6, 7, 8 };
std::transform(a, a+4, b, a, (boost::lambda::_1 + boost::lambda::_2));
for (int i=0; i<4; ++i)
std::cout << a[i] << ", ";
std::cout << std::endl;
return 0;
}
它是由Debian Linux上的g ++ - 4.9.1编译的,运行良好,适用于32位和64位架构。
也是i686-w64-mingw32-g ++(4.9.1)交叉编译并运行良好。
但x86_64-w64-mingw32-g ++(4.9.1)无法对64位架构进行交叉编译,如下所示:
$ x86_64-w64-mingw32-g++ -I/opt/win64/include transform.cpp -static
In file included from /usr/lib/gcc/x86_64-w64-mingw32/4.9-win32/include/c++/algorithm:62:0,
from /opt/win64/include/boost/core/swap.hpp:25,
from /opt/win64/include/boost/utility/swap.hpp:15,
from /opt/win64/include/boost/tuple/detail/tuple_basic.hpp:40,
from /opt/win64/include/boost/tuple/tuple.hpp:28,
from /opt/win64/include/boost/lambda/core.hpp:28,
from /opt/win64/include/boost/lambda/lambda.hpp:14,
from transform.cpp:1:
/usr/lib/gcc/x86_64-w64-mingw32/4.9-win32/include/c++/bits/stl_algo.h: In instantiation of ‘_OIter std::transform(_IIter1, _IIter1, _IIter2, _OIter, _BinaryOperation) [with _IIter1 = long long unsigned int*; _IIter2 = long long unsigned int*; _OIter = long long unsigned int*; _BinaryOperation = boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::arithmetic_action<boost::lambda::plus_action>, boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::lambda::lambda_functor<boost::lambda::placeholder<2> >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > >]’:
transform.cpp:11:92: required from here
/usr/lib/gcc/x86_64-w64-mingw32/4.9-win32/include/c++/bits/stl_algo.h:4202:12: error: cannot convert ‘boost::lambda::lambda_functor_base<boost::lambda::arithmetic_action<boost::lambda::plus_action>, boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::lambda::lambda_functor<boost::lambda::placeholder<2> >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> >::sig<boost::tuples::tuple<long long unsigned int&, long long unsigned int&, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> >::type {aka boost::lambda::detail::return_type_deduction_failure<boost::lambda::detail::return_type_2_arithmetic_phase_3<long long unsigned int, long long unsigned int> >}’ to ‘long long unsigned int’ in assignment
*__result = __binary_op(*__first1, *__first2);
^
In file included from /opt/win64/include/boost/lambda/lambda.hpp:22:0,
from transform.cpp:1:
/opt/win64/include/boost/lambda/detail/operator_lambda_func_base.hpp: In instantiation of ‘RET boost::lambda::lambda_functor_base<boost::lambda::arithmetic_action<boost::lambda::plus_action>, Args>::call(A&, B&, C&, Env&) const [with RET = boost::lambda::detail::return_type_deduction_failure<boost::lambda::detail::return_type_2_arithmetic_phase_3<long long unsigned int, long long unsigned int> >; A = long long unsigned int; B = long long unsigned int; C = const boost::tuples::null_type; Env = const boost::tuples::null_type; Args = boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::lambda::lambda_functor<boost::lambda::placeholder<2> >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>]’:
/opt/win64/include/boost/lambda/detail/lambda_functors.hpp:211:39: required from ‘typename boost::lambda::lambda_functor<Base>::inherited::sig<boost::tuples::tuple<A&, B&> >::type boost::lambda::lambda_functor<Base>::operator()(A&, B&) const [with A = long long unsigned int; B = long long unsigned int; T = boost::lambda::lambda_functor_base<boost::lambda::arithmetic_action<boost::lambda::plus_action>, boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::lambda::lambda_functor<boost::lambda::placeholder<2> >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> >; typename boost::lambda::lambda_functor<Base>::inherited::sig<boost::tuples::tuple<A&, B&> >::type = boost::lambda::detail::return_type_deduction_failure<boost::lambda::detail::return_type_2_arithmetic_phase_3<long long unsigned int, long long unsigned int> >]’
/usr/lib/gcc/x86_64-w64-mingw32/4.9-win32/include/c++/bits/stl_algo.h:4202:46: required from ‘_OIter std::transform(_IIter1, _IIter1, _IIter2, _OIter, _BinaryOperation) [with _IIter1 = long long unsigned int*; _IIter2 = long long unsigned int*; _OIter = long long unsigned int*; _BinaryOperation = boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::arithmetic_action<boost::lambda::plus_action>, boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::lambda::lambda_functor<boost::lambda::placeholder<2> >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > >]’
transform.cpp:11:92: required from here
/opt/win64/include/boost/lambda/detail/operator_lambda_func_base.hpp:160:72: error: could not convert ‘(boost::lambda::detail::select<boost::lambda::placeholder<1>, long long unsigned int, long long unsigned int, const boost::tuples::null_type, const boost::tuples::null_type>((* & boost::tuples::get<0, boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::tuples::cons<boost::lambda::lambda_functor<boost::lambda::placeholder<2> >, boost::tuples::null_type> >((* &((const boost::lambda::lambda_functor_base<boost::lambda::arithmetic_action<boost::lambda::plus_action>, boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::lambda::lambda_functor<boost::lambda::placeholder<2> >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> >*)this)->boost::lambda::lambda_functor_base<boost::lambda::arithmetic_action<boost::lambda::plus_action>, boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::lambda::lambda_functor<boost::lambda::placeholder<2> >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> >::args.boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::lambda::lambda_functor<boost::lambda::placeholder<2> >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>::<anonymous>))), (* & a), (* & b), (* & c), (* & env)) + boost::lambda::detail::select<boost::lambda::placeholder<2>, long long unsigned int, long long unsigned int, const boost::tuples::null_type, const boost::tuples::null_type>((* & boost::tuples::get<1, boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::tuples::cons<boost::lambda::lambda_functor<boost::lambda::placeholder<2> >, boost::tuples::null_type> >((* &((const boost::lambda::lambda_functor_base<boost::lambda::arithmetic_action<boost::lambda::plus_action>, boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::lambda::lambda_functor<boost::lambda::placeholder<2> >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> >*)this)->boost::lambda::lambda_functor_base<boost::lambda::arithmetic_action<boost::lambda::plus_action>, boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::lambda::lambda_functor<boost::lambda::placeholder<2> >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> >::args.boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::lambda::lambda_functor<boost::lambda::placeholder<2> >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>::<anonymous>))), (* & a), (* & b), (* & c), (* & env)))’ from ‘long long unsigned int’ to ‘boost::lambda::detail::return_type_deduction_failure<boost::lambda::detail::return_type_2_arithmetic_phase_3<long long unsigned int, long long unsigned int> >’
detail::select(boost::tuples::get<1>(args), CALL_ACTUAL_ARGS); \
^
/opt/win64/include/boost/lambda/detail/operator_lambda_func_base.hpp:206:1: note: in expansion of macro ‘BOOST_LAMBDA_BINARY_ACTION’
BOOST_LAMBDA_BINARY_ACTION(+,arithmetic_action<plus_action>)
^
是的,TL; DR
基本上出现了问题, boost::lambda::_1 + boost::lambda::_2
与size_t
结合使用(其他类型如int
似乎没问题)。
为什么会有问题? 是一个提升中的错误?
如果类型被声明为unsigned long long
而不是size_t
那么这在Coliru上是可重现的。 long long
也失败了。
这看起来像是一个提升中的错误。 它们用于操作员返回类型推导的大规模复杂模板机制 (很可能在C ++ 11中很可能完全被decltype
废弃)不支持long long
或unsigned long long
(它在写入C ++标准之前写得很好) )。 问题只出现在64位MinGW中的size_t
,因为这是唯一的long
为32位但size_t
需要为64位的平台,因此需要使用long long
。
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