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authorDan Goodliffe <dan@randomdan.homeip.net>2022-12-29 00:04:36 +0000
committerDan Goodliffe <dan@randomdan.homeip.net>2022-12-29 00:04:36 +0000
commit10ee9a9c7c0742f808b4e732579dc3578cb5c2b5 (patch)
tree977cb31f824890b4c817bbf1e18bb98563583502 /lib/collections.hpp
parentconstexpr collections helpers (diff)
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Add helper to produce cartesian product of two arrays
Diffstat (limited to 'lib/collections.hpp')
-rw-r--r--lib/collections.hpp14
1 files changed, 14 insertions, 0 deletions
diff --git a/lib/collections.hpp b/lib/collections.hpp
index c9b0127..beb01f8 100644
--- a/lib/collections.hpp
+++ b/lib/collections.hpp
@@ -13,6 +13,20 @@ operator+(const std::array<T, first> & a, const std::array<T, second> & b)
return r;
}
+template<typename T, typename V, std::size_t first, std::size_t second>
+constexpr std::array<std::pair<T, V>, first * second>
+operator*(const std::array<T, first> & a, const std::array<V, second> & b)
+{
+ std::array<std::pair<T, V>, first * second> r;
+ auto out = r.begin();
+ for (const auto & ae : a) {
+ for (const auto & be : b) {
+ *out++ = {ae, be};
+ }
+ }
+ return r;
+}
+
template<typename T, std::size_t N>
constexpr auto
operator*(const std::array<T, N> & in, auto && f)