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explain comma trick

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Hans Dembinski 2019-06-03 23:31:20 +02:00
parent 3b687db2bc
commit e04a765b1f
1 changed files with 2 additions and 0 deletions
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include/boost/histogram/axis/traits.hpp
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@ -28,6 +28,8 @@ using static_options_impl = axis::option::bitset<T::options()>;
template <class I, class D, class A> template <class I, class D, class A>
double value_method_switch_impl1(std::false_type, I&&, D&&, const A&) { double value_method_switch_impl1(std::false_type, I&&, D&&, const A&) {
// comma trick to make all compilers happy; some would complain about
// unreachable code after the throw, others about a missing return
return BOOST_THROW_EXCEPTION( return BOOST_THROW_EXCEPTION(
std::runtime_error(cat(type_name<A>(), " has no value method"))), std::runtime_error(cat(type_name<A>(), " has no value method"))),
double{}; double{};