narrowing conversion error with -std=c++0x in operator< with int_type != int

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With GCC (4.6) and -std=c++0x, there are several narrowing conversion errors in operator< if int_type is different from int, for example, short int. Example: #include <boost/rational.hpp> int main() { return boost::rational<short int>() < boost::rational<short int>(); } Error output: /tmp/boost/boost/rational.hpp: In member function ‘bool boost::rational<IntType>::operator<(const boost::rational<IntType>&) const [with IntType = short int]’: /tmp/boost/boost/rational.hpp:393:39: error: narrowing conversion of ‘(((int)((const boost::rational<short int>*)this)->boost::rational<short int>::num) / ((int)((const boost::rational<short int>*)this)->boost::rational<short int>::den))’ from ‘int’ to ‘boost::rational<short int>::int_type {aka short int}’ inside { } [-fpermissive] /tmp/boost/boost/rational.hpp:393:39: error: narrowing conversion of ‘(((int)((const boost::rational<short int>*)this)->boost::rational<short int>::num) % ((int)((const boost::rational<short int>*)this)->boost::rational<short int>::den))’ from ‘int’ to ‘boost::rational<short int>::int_type {aka short int}’ inside { } [-fpermissive] ...

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Test case. Compile with gcc -std=c++0x to trigger

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Proposed fix.

[Daryle Walker]

(In [85418]) Used static_cast to suppress a warning/error about a narrowing conversion. Fixes #5855.