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Passing fmt_data to format_arg functions as constant expression

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This commit is contained in:
Andreas Tsouchlos 2021-11-26 14:44:17 +01:00
parent a0230a7e27
commit 9b430b9902
3 changed files with 10 additions and 34 deletions
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15
inc/format.h
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@ -41,20 +41,21 @@ constexpr inline void check_fmt_params() {
*/ */
// TODO: Error handling // TODO: Error handling
template <std::integral arg_t> template <fmt_data_t fmt_data, std::integral arg_t>
constexpr inline void format_arg(char* dest, fmt_data_t fmt_data, arg_t arg) { constexpr inline void format_arg(char* dest, arg_t arg) {
// constexpr auto error_array = get_init_array<fmt_data.length>('f'); auto error_array = get_init_array<fmt_data.length>('f');
detail::format_integral(dest, arg, fmt_data); detail::format_integral(dest, arg, fmt_data);
}; };
// TODO: Error handling // TODO: Error handling
template <std::floating_point arg_t> template <fmt_data_t fmt_data, std::floating_point arg_t>
constexpr inline void format_arg(char* dest, fmt_data_t fmt_data, arg_t) { constexpr inline void format_arg(char* dest, arg_t) {
*(dest) = 'f'; *(dest) = 'f';
*(dest + fmt_data.length - fmt_data.precision - 1) = '.'; *(dest + fmt_data.length - fmt_data.precision - 1) = '.';
}; };
// TODO: Error handling // TODO: Error handling
constexpr inline void format_arg(char* dest, fmt_data_t fmt_data, const char* arg) { template<fmt_data_t fmt_data>
constexpr inline void format_arg(char* dest, const char* arg) {
const std::size_t len = const_strlen(arg); const std::size_t len = const_strlen(arg);
if (len > fmt_data.length) return; if (len > fmt_data.length) return;
@ -77,7 +78,7 @@ constexpr inline void format_args(char*) {
template <auto fmt_data_array, typename first_arg_t, typename... args_t> 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) { constexpr inline void format_args(char* dest, first_arg_t first_arg, args_t... args) {
format_arg(dest + fmt_data_array[0].position, fmt_data_array[0], first_arg); format_arg<fmt_data_array[0]>(dest + fmt_data_array[0].position, first_arg);
format_args<drop_first(fmt_data_array)>(dest, args...); format_args<drop_first(fmt_data_array)>(dest, args...);
} }

2
inc/format_impl.h
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@ -90,7 +90,7 @@ constexpr inline void format_integral(char* out, uint_t value,
template <std::floating_point float_t> template <std::floating_point float_t>
constexpr inline void format_integral(char* out, float_t value, constexpr inline void format_floating_point(char* out, float_t value,
fmt_data_t fmt_node) { fmt_data_t fmt_node) {
// TODO // TODO
} }

27
inc/utility.h
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@ -18,18 +18,8 @@ constexpr inline std::size_t const_pow(std::size_t base, std::size_t pow) {
} }
//template <std::size_t t_n>
//constexpr std::array<char, t_n> get_zero_array() {
// std::array<char, t_n> result;
//
// for (auto& c : result)
// c = '0';
//
// return result;
//}
template <std::size_t t_n> template <std::size_t t_n>
constexpr inline std::array<char, t_n> get_init_array(char val) { consteval inline std::array<char, t_n> get_init_array(char val) {
std::array<char, t_n> result; std::array<char, t_n> result;
for (auto& c : result) for (auto& c : result)
@ -38,21 +28,6 @@ constexpr inline std::array<char, t_n> get_init_array(char val) {
return result; return result;
} }
//template <fmt_node_t fmt_node>
//constexpr std::array<char, fmt_node.length> get_init_array() {
// std::array<char, fmt_node.length> result;
//
// if constexpr (fmt_node.has_zero_padding) {
// for (auto& c : result)
// c = '0';
// } else {
// for (auto& c : result)
// c = ' ';
// }
//
// return result;
//}
template <auto ast> template <auto ast>
consteval inline std::size_t count_ast_format_nodes() { consteval inline std::size_t count_ast_format_nodes() {