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| -rw-r--r-- | compat/functional.hpp | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/compat/functional.hpp b/compat/functional.hpp index e7229d6e..141bbef7 100644 --- a/compat/functional.hpp +++ b/compat/functional.hpp @@ -38,6 +38,19 @@ inline void maybe_reserve_space(seq_& seq, unsigned sz) } // ns +template<typename t, t value_> +struct constant final +{ + using type = t; + constexpr type operator()() const noexcept + { + return value_; + } + static constexpr type value = value_; + + constant() = delete; +}; + template<typename seq_, typename F> auto map(F&& fun, const seq_& seq) { |