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🎨 Support ct_capacity for C-style arrays #333

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Merged
elbeno merged 1 commit into from
Mar 3, 2026
Merged

🎨 Support ct_capacity for C-style arrays #333

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3 changes: 3 additions & 0 deletions include/stdx/iterator.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,9 @@ constexpr auto ct_capacity_v = detail::ct_capacity_fail<T>{};
template <typename T, std::size_t N>
constexpr auto ct_capacity_v<std::array<T, N>> = N;

// NOLINTNEXTLINE(modernize-avoid-c-arrays)
template <typename T, std::size_t N> constexpr auto ct_capacity_v<T[N]> = N;

template <typename T> constexpr auto ct_capacity_v<T const> = ct_capacity_v<T>;

template <typename T>
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5 changes: 5 additions & 0 deletions test/iterator.cpp
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Expand Up @@ -20,6 +20,11 @@ TEST_CASE("compile-time capacity (std::array)", "[iterator]") {
STATIC_REQUIRE(stdx::ct_capacity(a) == 4u);
}

TEST_CASE("compile-time capacity (C-style array)", "[iterator]") {
int a[4]{};
STATIC_REQUIRE(stdx::ct_capacity(a) == 4u);
}

#if __cpp_lib_span >= 202002L
TEST_CASE("compile-time capacity (std::span)", "[iterator]") {
std::array a{1, 2, 3, 4};
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