Merge pull request 'feature/no_std_lib' (#9) from feature/no_std_lib into master

Reviewed-on: http://git.mercurial-manifold.eu/an.tsouchlos/const_fmt/pulls/9

const_fmt/format.h

@@ -57,7 +57,7 @@ constexpr inline void format_arg(char* dest, const char* arg) {
     dest = dest + fmt_data.length - len;
 
     if (!std::is_constant_evaluated()) {
-        std::memcpy(dest, arg, len);
+        memcpy(dest, arg, len);
         return;
     }
     for (std::size_t i = 0; i < len; ++i) {

const_fmt/format_impl.h

@@ -12,6 +12,7 @@
 
 #include <stdint.h>
 
+#include "stdlib.h"
 #include "utility.h"
 
 
@@ -119,7 +120,7 @@ constexpr inline const char* digits2_base(size_t value) {
 
 constexpr inline void copy2(char* dst, const char* src) {
     if (!std::is_constant_evaluated()) {
-        std::memcpy(dst, src, 2);
+        memcpy(dst, src, 2);
         return;
     }
     *dst++ = static_cast<char>(*src++);

const_fmt/parse.h

@@ -5,7 +5,7 @@
 #include "types.h"
 
 
-// clang-const_format off
+// clang-format off
 
 /*
  *
@@ -34,7 +34,7 @@
  *
  */
 
-// clang-const_format on
+// clang-format on
 
 
 namespace const_fmt { namespace const_fmt_detail {

const_fmt/stdlib.h

@@ -0,0 +1,300 @@
+#ifndef CONST_FMT_STDLIB_H
+#define CONST_FMT_STDLIB_H
+
+
+/*
+ *
+ * Disclaimer: Very bad (partially at least) implementation of some features of
+ * the C++ Standard Library. Not meant as a full-on stdlib implementation, only
+ * for usage in this project (Underlined by the fact, that in this case the
+ * namespace std is actually const_fmt::std)
+ *
+ */
+
+
+#ifndef CONST_FMT_NO_CPP_STDLIB
+
+#include <array>
+#include <cstring>
+
+#else
+
+#include <stdint.h>
+#include <string.h>
+
+
+namespace const_fmt { namespace std {
+
+
+using size_t = uint16_t;
+
+
+/*
+ *
+ * type_traits
+ *
+ */
+
+
+// various
+
+
+constexpr inline bool is_constant_evaluated() noexcept {
+    return __builtin_is_constant_evaluated();
+}
+
+struct true_type {
+    constexpr static bool value = true;
+};
+
+struct false_type {
+    constexpr static bool value = false;
+};
+
+
+// is_same
+
+
+template <typename fist_t, typename second_t>
+struct is_same : public false_type {};
+
+template <typename type_t>
+struct is_same<type_t, type_t> : public true_type {};
+
+
+// is_one_of
+
+
+template <typename...>
+struct is_one_of;
+template <typename type_t>
+struct is_one_of<type_t> {
+    constexpr static bool value = false;
+};
+template <typename type_t, typename first_t, typename... rest_t>
+struct is_one_of<type_t, first_t, rest_t...> {
+    constexpr static bool value = std::is_same<type_t, first_t>::value ||
+                                  is_one_of<type_t, rest_t...>::value;
+};
+
+
+// remove_x
+
+
+// clang-format off
+
+template <typename type_t> struct remove_cv                        { typedef type_t type; };
+template <typename type_t> struct remove_cv<const type_t>          { typedef type_t type; };
+template <typename type_t> struct remove_cv<volatile type_t>       { typedef type_t type; };
+template <typename type_t> struct remove_cv<const volatile type_t> { typedef type_t type; };
+
+template <typename type_t> struct remove_const                     { typedef type_t type; };
+template <typename type_t> struct remove_const<const type_t>       { typedef type_t type; };
+
+template <typename type_t> struct remove_volatile                  { typedef type_t type; };
+template <typename type_t> struct remove_volatile<volatile type_t> { typedef type_t type; };
+
+template <typename type_t> struct remove_reference                 { using type = type_t; };
+template <typename type_t> struct remove_reference<type_t &>       { using type = type_t; };
+template <typename type_t> struct remove_reference<type_t &&>      { using type = type_t; };
+
+template <typename type_t> using remove_reference_t = typename std::remove_reference<type_t>::type;
+template <typename type_t> using remove_cv_t        = typename std::remove_cv<type_t>::type;
+template <typename type_t> using remove_const_t     = typename std::remove_const<type_t>::type;
+template <typename type_t> using remove_volatile_t  = typename std::remove_volatile<type_t>::type;
+
+// clang-format on
+
+
+// is_integral
+
+
+template <typename type_t>
+using is_integral =
+    is_one_of<remove_cv_t<type_t>, bool, char, signed char, unsigned char,
+              wchar_t, char16_t, char32_t, short, unsigned short, int,
+              unsigned int, long, unsigned long, long long, unsigned long long>;
+
+
+// is_signed
+
+
+template <typename _Tp>
+using is_signed_integer = is_one_of<remove_cv_t<_Tp>, signed char, signed short,
+                                    signed int, signed long, signed long long>;
+
+
+
+// is_floating_point
+
+
+template <typename type_t>
+using is_floating_point =
+    is_one_of<remove_cv_t<type_t>, float, double, long double>;
+
+
+// make_unsigned
+
+
+// clang-format off
+
+template <typename type_t> struct make_unsigned    { using type = type_t; };
+
+template <> struct make_unsigned<signed char>      { using type = char; };
+template <> struct make_unsigned<unsigned short>   { using type = unsigned short; };
+template <> struct make_unsigned<signed int>       { using type = unsigned int; };
+template <> struct make_unsigned<signed long>      { using type = unsigned long; };
+template <> struct make_unsigned<signed long long> { using type = unsigned long long; };
+
+// clang-format on
+
+
+// value definitions
+
+template <typename type_t>
+inline constexpr bool is_integral_v = is_integral<type_t>::value;
+template <typename type_t>
+inline constexpr bool is_signed_integer_v = is_signed_integer<type_t>::value;
+template <typename type_t>
+inline constexpr bool is_floating_point_v = is_floating_point<type_t>::value;
+
+
+/*
+ *
+ * concepts
+ *
+ */
+
+
+template <typename type_t>
+concept integral = is_integral_v<type_t>;
+
+template <typename type_t>
+concept signed_integral = is_signed_integer_v<type_t>;
+
+template <typename type_t>
+concept unsigned_integral = integral<type_t> && !signed_integral<type_t>;
+
+template <typename type_t>
+concept floating_point = is_floating_point_v<type_t>;
+
+
+/*
+ *
+ * algorithm
+ *
+ */
+
+
+template <typename input_t, typename output_t>
+constexpr inline void copy(const input_t* start, const input_t* end, output_t* dest_start) {
+    auto temp = start;
+    while (temp != end)
+        *(dest_start++) = *(temp++);
+}
+
+
+/*
+ *
+ * utility
+ *
+ */
+
+
+template <typename T>
+std::remove_reference_t<T>&& move(T&& arg) noexcept {
+    return reinterpret_cast<std::remove_reference_t<T>&&>(arg);
+}
+
+template <typename T>
+constexpr inline void swap(T& t1, T& t2) {
+    T temp = std::move(t1);
+    t1     = std::move(t2);
+    t2     = std::move(temp);
+}
+
+template <typename first_t, typename second_t>
+struct pair {
+    first_t  first;
+    second_t second;
+};
+
+
+/*
+ *
+ * array
+ *
+ */
+
+
+// TODO: Is std::size_t really the best bet here?
+template <typename data_t, std::size_t t_size>
+class array {
+public:
+    template <typename... args_t>
+    constexpr array(args_t... args) noexcept : m_data{args...} {
+        static_assert(sizeof...(args) == t_size, "Invalid number of arguments");
+    }
+
+    constexpr array() noexcept = default;
+    constexpr array(const array&) = default;
+    constexpr array(array&&) = default;
+
+    constexpr array& operator=(const array& other) = default;
+    constexpr array& operator=(array&& other) = default;
+
+    constexpr void swap(array<data_t, t_size>& other) noexcept {
+        for (int i = 0; i < t_size; ++i) {
+            using std::swap;
+            swap(m_data[i], other.m_data[i]);
+        }
+    }
+
+
+    constexpr data_t& operator[](std::size_t index) noexcept {
+        return m_data[index];
+    }
+
+    constexpr const data_t& operator[](std::size_t index) const noexcept {
+        return m_data[index];
+    }
+
+
+    using iterator       = data_t*;
+    using const_iterator = const data_t*;
+
+    constexpr iterator begin() noexcept {
+        return &(m_data[0]);
+    }
+
+    constexpr iterator end() noexcept {
+        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]);
+    }
+
+    constexpr const_iterator cend() const noexcept {
+        return (&(m_data[t_size - 1]) + 1);
+    }
+
+    data_t m_data[t_size];
+};
+
+
+}} // namespace const_fmt::std
+
+
+#endif
+
+
+#endif // CONST_FMT_STDLIB_H

const_fmt/types.h

@@ -2,7 +2,8 @@
 #define LOGGER_TYPES_H
 
 
-#include <array>
+
+#include "stdlib.h"
 
 
 namespace const_fmt { namespace const_fmt_detail {
@@ -19,8 +20,7 @@ template <std::size_t N>
 class ConstString {
 public:
     constexpr ConstString(const char (&content)[N]) noexcept {
-        std::copy(std::begin(content), std::end(content),
-                  std::begin(m_content));
+        std::copy(&content[0], (&content[N - 1] + 1), m_content.begin());
     }
 
     constexpr char operator[](std::size_t index) const noexcept {

const_fmt/utility.h

@@ -2,8 +2,9 @@
 #define LOGGER_UTILITY_H
 
 
-#include <cstring>
+#include <string.h>
 
+#include "stdlib.h"
 #include "types.h"
 
 

examples/src/examples.cpp

@@ -1,6 +1,8 @@
+#define CONST_FMT_NO_CPP_STDLIB
+
 #include <const_fmt/format.h>
-#include <iostream>
-#include <string_view>
+//#include <iostream>
+//#include <string_view>
 
 using namespace const_fmt;
 
@@ -9,9 +11,9 @@ int main() {
 
     // Convert s (with a type of 'std::array<char, N>') into something
     // writable to std::cout
-    std::string_view sv{&s[0], s.size()};
-
-    std::cout << sv << std::endl;
+//    std::string_view sv{&s[0], s.size()};
+//
+//    std::cout << sv << std::endl;
 
     return 0;
 }