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Implemented count_digits for hex and started implementing digits2_base

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This commit is contained in:
Andreas Tsouchlos 2022-02-15 11:13:15 +01:00
parent f9099ce6ee
commit 7115e09aca
2 changed files with 45 additions and 12 deletions
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55
const_fmt/format_impl.h
View File

@ -70,11 +70,21 @@ constexpr inline auto count_digits_base(uint64_t n) -> int {
return result;
} else {
if (!std::is_constant_evaluated()) {
return do_count_digits_decimal(n);
}
if constexpr (t_format_type == FormatType::x) {
int result = 0;
return count_digits_decimal_fallback(n);
while (n) {
n = n >> 4;
result += 1;
}
return (result + count_digits_base<FormatType::b>(n));
} else {
if (!std::is_constant_evaluated()) {
return do_count_digits_decimal(n);
}
return count_digits_decimal_fallback(n);
}
}
}
@ -86,11 +96,24 @@ constexpr inline const char* digits2_base(size_t value) {
if constexpr (t_format_type == FormatType::b) {
return &"00011011"[value * 2];
} else {
return &"0001020304050607080910111213141516171819"
"2021222324252627282930313233343536373839"
"4041424344454647484950515253545556575859"
"6061626364656667686970717273747576777879"
"8081828384858687888990919293949596979899"[value * 2];
if constexpr (t_format_type == FormatType::x) {
// clang-format off
return &"000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F"
"202122232425262728292A2B2C2D2E2F303132333435363738393A3B3C3D3E3F"
"404142434445464748494A4B4C4D4E4F505152535455565758595A5B5C5D5E5F"
"606162636465666768696A6B6C6D6E6F707172737475767778796A6B6C6D6E6F"
"808182838485868788898A8B8C8D8E8F909192939495969798999A9B9C9D9E9F"
"A0A1A2A3A4A5A6A7A8A9AAABACADAEAFB0B1B2B3B4B5B6B7B8B9BABBBCBDBEBF"
"C0C1C2C3C4C5C6C7C8C9CACBCCCDCECFD0D1D2D3D4D5D6D7D8D9DADBDCDDDEDF"
"E0E1E2E3E4E5E6E7E8E9EAEBECEDEEEFF0F1F2F3F4F5F6F7F8F9FAFBFCFDFEFF"[value * 2];
// clang-format on
} else {
return &"0001020304050607080910111213141516171819"
"2021222324252627282930313233343536373839"
"4041424344454647484950515253545556575859"
"6061626364656667686970717273747576777879"
"8081828384858687888990919293949596979899"[value * 2];
}
}
}
@ -104,11 +127,22 @@ constexpr inline void copy2(char* dst, const char* src) {
*dst = static_cast<char>(*src);
}
template <FormatType t_format_type>
consteval inline unsigned get_base_divisor() {
switch (t_format_type) {
case FormatType::b:
return 2;
case FormatType::x:
return 16;
default:
return 10;
}
}
template <FormatType t_format_type, typename uint_t>
constexpr inline void format_base(char* out, uint_t value, int n_digits,
int size) {
constexpr unsigned divisor = (t_format_type == FormatType::b) ? 2 : 10;
constexpr unsigned divisor = get_base_divisor<t_format_type>();
constexpr unsigned square_divisor = const_pow(divisor, 2);
if (n_digits > size) {
@ -165,7 +199,6 @@ constexpr std::pair<int_t, bool> get_abs_value(int_t value) {
template <fmt_data_t t_fmt_node, std::unsigned_integral uint_t>
constexpr inline void format_int(char* out, uint_t value) {
// format_decimal(out, value, count_digits(value), t_fmt_node.length);
format_base<t_fmt_node.type>(out, value,
count_digits_base<t_fmt_node.type>(value),
t_fmt_node.length);

2
examples/src/examples.cpp
View File

@ -5,7 +5,7 @@
using namespace const_fmt;
int main() {
constexpr auto s = "This is an integer: {:08b}, and this is a float: {:09.4b}"_const_fmt(125u, -86.2);
constexpr auto s = "This is an integer: {:08x}, and this is a float: {:09.4b}"_const_fmt(125u, -86.2);
// Convert s (with a type of 'std::array<char, N>') into something
// writable to std::cout