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Allow printing an empty tuple

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[SVN r53211]
This commit is contained in:
Steven Watanabe
2009-05-23 16:39:13 +00:00
parent 70e04d2965
commit 08277fd057
2 changed files with 53 additions and 5 deletions
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32
include/boost/tuple/tuple_io.hpp
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@ -285,6 +285,21 @@ print(std::basic_ostream<CharType, CharTrait>& o, const cons<T1, T2>& t) {
} // namespace detail
#if defined (BOOST_NO_TEMPLATED_STREAMS)
inline std::ostream& operator<<(std::ostream& o, const null_type& t) {
if (!o.good() ) return o;
const char l =
detail::format_info::get_manipulator(o, detail::format_info::open);
const char r =
detail::format_info::get_manipulator(o, detail::format_info::close);
o << l;
o << r;
return o;
}
template<class T1, class T2>
inline std::ostream& operator<<(std::ostream& o, const cons<T1, T2>& t) {
if (!o.good() ) return o;
@ -305,6 +320,23 @@ inline std::ostream& operator<<(std::ostream& o, const cons<T1, T2>& t) {
#else
template<class CharType, class CharTrait>
inline std::basic_ostream<CharType, CharTrait>&
operator<<(std::basic_ostream<CharType, CharTrait>& o,
const null_type& t) {
if (!o.good() ) return o;
const CharType l =
detail::format_info::get_manipulator(o, detail::format_info::open);
const CharType r =
detail::format_info::get_manipulator(o, detail::format_info::close);
o << l;
o << r;
return o;
}
template<class CharType, class CharTrait, class T1, class T2>
inline std::basic_ostream<CharType, CharTrait>&
operator<<(std::basic_ostream<CharType, CharTrait>& o,

26
test/io_test.cpp
View File

@ -70,6 +70,15 @@ int test_main(int argc, char * argv[] ) {
os1 << make_tuple(1, 2, 3);
BOOST_CHECK (os1.str() == std::string("[1,2,3][1,2,3]") );
// check empty tuple.
useThisOStringStream os3;
os3 << make_tuple();
BOOST_CHECK (os3.str() == std::string("()") );
os3 << set_open('[');
os3 << set_close(']');
os3 << make_tuple();
BOOST_CHECK (os3.str() == std::string("()[]") );
ofstream tmp("temp.tmp");
#if !defined (BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
@ -98,12 +107,19 @@ int test_main(int argc, char * argv[] ) {
// reading tuple<int, int, int> in format (a b c);
useThisIStringStream is("(100 200 300)");
tuple<int, int, int> ti;
BOOST_CHECK(bool(is >> ti));
BOOST_CHECK(ti == make_tuple(100, 200, 300));
useThisIStringStream is1("(100 200 300)");
tuple<int, int, int> ti1;
BOOST_CHECK(bool(is1 >> ti1));
BOOST_CHECK(ti1 == make_tuple(100, 200, 300));
useThisIStringStream is2("()");
tuple<> ti2;
BOOST_CHECK(bool(is2 >> ti2));
useThisIStringStream is3("[]");
is3 >> set_open('[');
is3 >> set_close(']');
BOOST_CHECK(bool(is3 >> ti2));
// Note that strings are problematic:
// writing a tuple on a stream and reading it back doesn't work in