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Make transition_sa and transition_sg constructors constexpr #714

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Merged
kris-jusiak merged 1 commit into from
Jul 12, 2026
Merged

Make transition_sa and transition_sg constructors constexpr #714

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4 changes: 2 additions & 2 deletions include/boost/sml.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3135,7 +3135,7 @@ struct transition<state<S1>, state<S2>> : transition<state<S1>, state<S2>, front
template <class S2, class G>
struct transition_sg<state<S2>, G> : transition<state<internal>, state<S2>, front::event<back::anonymous>, G, none> {
using transition<state<internal>, state<S2>, front::event<back::anonymous>, G, none>::g;
transition_sg(const state<S2> &, const G &g_init)
constexpr transition_sg(const state<S2> &, const G &g_init)
: transition<state<internal>, state<S2>, front::event<back::anonymous>, G, none>{g_init, none{}} {}
template <class T>
constexpr auto operator/(const T &t) const {
Expand All @@ -3149,7 +3149,7 @@ struct transition_sg<state<S2>, G> : transition<state<internal>, state<S2>, fron
template <class S2, class A>
struct transition_sa<state<S2>, A> : transition<state<internal>, state<S2>, front::event<back::anonymous>, always, A> {
using transition<state<internal>, state<S2>, front::event<back::anonymous>, always, A>::a;
transition_sa(const state<S2> &, const A &a_init)
constexpr transition_sa(const state<S2> &, const A &a_init)
: transition<state<internal>, state<S2>, front::event<back::anonymous>, always, A>{always{}, a_init} {}
template <class T>
constexpr auto operator=(const T &) const {
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22 changes: 22 additions & 0 deletions test/ft/constexpr.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,8 @@ namespace sml = boost::sml;
struct e1 {};

const auto idle = sml::state<class idle>;
const auto s1 = sml::state<class s1>;
const auto s2 = sml::state<class s2>;

test constexpr_sm = [] {
using namespace sml;
Expand All @@ -37,3 +39,23 @@ test constexpr_sm = [] {

static_assert(test());
};

test constexpr_anonymous_transitions_sm = [] {
using namespace sml;
struct c {
// clang-format off
constexpr auto operator()() noexcept {
const auto guard = [] { return true; };
const auto action = [] {};
return make_transition_table(
*idle + event<e1> = s1,
s1[guard] = s2,
s2 / action = X
);
}
// clang-format on
};

constexpr sml::sm<c, sml::dispatch<sml::back::policies::branch_stm>> sm{};
(void)sm;
};
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