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improve cstring ctr

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This commit is contained in:
Neargye 2019-12-13 20:31:55 +05:00
parent f7554a166f
commit d33424c377
1 changed files with 15 additions and 9 deletions
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24
include/nameof.hpp
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@ -43,6 +43,12 @@
#include <type_traits>
#include <utility>
#if defined(_MSC_VER)
# pragma warning(push)
# pragma warning(disable : 26495) // Variable 'nameof::cstring<N>::chars_' is uninitialized.
# pragma warning(disable : 26451) // Arithmetic overflow: 'strings_[static_cast<U>(value) - min_v<E>]' and 'indexes_[static_cast<U>(value) - min_v<E>]' using operator '-' on a 4 byte value and then casting the result to a 8 byte value.
#endif
// Checks nameof_type compiler compatibility.
#if defined(__clang__) || defined(__GNUC__) || defined(_MSC_VER)
# undef NAMEOF_TYPE_SUPPORTED
@ -94,14 +100,8 @@ class [[nodiscard]] cstring {
std::array<char, N + 1> chars_;
constexpr auto to_chars(std::string_view str) noexcept {
assert(str.size() == N);
decltype(chars_) chars = {};
for (std::size_t i = 0; i < str.size() && i < N; ++i) {
chars[i] = str[i];
}
return chars;
}
template <std::size_t... I>
constexpr cstring(std::string_view str, std::index_sequence<I...>) noexcept : chars_{{str[I]..., '\0'}} {}
public:
using value_type = char;
@ -118,7 +118,9 @@ class [[nodiscard]] cstring {
using reverse_iterator = std::reverse_iterator<iterator>;
using const_reverse_iterator = std::reverse_iterator<const_iterator>;
constexpr explicit cstring(std::string_view str) noexcept : chars_{to_chars(str)} {}
constexpr explicit cstring(std::string_view str) noexcept : cstring{str, std::make_index_sequence<N>{}} {
assert(str.size() == N);
}
constexpr cstring() = delete;
@ -662,4 +664,8 @@ template <typename T>
// Obtains string name full type of expression, with reference and cv-qualifiers.
#define NAMEOF_FULL_TYPE_EXPR(...) ::nameof::nameof_full_type<decltype(__VA_ARGS__)>()
#if defined(_MSC_VER)
# pragma warning(pop)
#endif
#endif // NEARGYE_NAMEOF_HPP