Merge pull request 'fix/zero_length_array' (#10) from fix/zero_length_array into master

Reviewed-on: http://git.mercurial-manifold.eu/an.tsouchlos/const_fmt/pulls/10

const_fmt/format.h

@@ -66,15 +66,12 @@ constexpr inline void format_arg(char* dest, const char* arg) {
 };
 
 
-// End of recursion
-template <auto ast>
-constexpr inline void format_args(char*) {
-}
-
 template <auto fmt_data_array, typename first_arg_t, typename... args_t>
 constexpr inline void format_args(char* dest, first_arg_t first_arg,
                                   args_t... args) {
     format_arg<fmt_data_array[0]>(dest + fmt_data_array[0].position, first_arg);
+
+    if constexpr(fmt_data_array.size() > 1)
         format_args<drop_first(fmt_data_array)>(dest, args...);
 }
 

const_fmt/stdlib.h

@@ -187,8 +187,11 @@ concept floating_point = is_floating_point_v<type_t>;
 
 
 template <typename input_t, typename output_t>
-constexpr inline void copy(input_t* start, input_t* end, output_t* dest_start) {
+constexpr inline void copy(const input_t* start, const input_t* end,
-    memcpy(start, dest_start, end - start);
+                           output_t* dest_start) {
+    auto temp = start;
+    while (temp != end)
+        *(dest_start++) = *(temp++);
 }
 
 
@@ -235,13 +238,10 @@ public:
     }
 
     constexpr array() noexcept    = default;
-
+    constexpr array(const array&) = default;
-    constexpr array(array&) = default;
-
     constexpr array(array&&)      = default;
 
-    constexpr array& operator=(array& other) = default;
+    constexpr array& operator=(const array& other) = default;
-
     constexpr array& operator=(array&& other) = default;
 
     constexpr void swap(array<data_t, t_size>& other) noexcept {
@@ -251,6 +251,9 @@ public:
         }
     }
 
+    constexpr std::size_t size() const noexcept {
+        return t_size;
+    }
 
     constexpr data_t& operator[](std::size_t index) noexcept {
         return m_data[index];
@@ -272,6 +275,14 @@ public:
         return (&(m_data[t_size - 1]) + 1);
     }
 
+    constexpr const_iterator begin() const noexcept {
+        return &(m_data[0]);
+    }
+
+    constexpr const_iterator end() const noexcept {
+        return (&(m_data[t_size - 1]) + 1);
+    }
+
     constexpr const_iterator cbegin() const noexcept {
         return &(m_data[0]);
     }