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#pragma once
#include "deimos/core/base.h"
namespace deimos
{
class IWriter;
struct CustomFormatter
{
using Callback = void (*)(IWriter*, const void* payload);
const void* payload;
Callback callback;
};
struct FormatArg
{
enum Type : uint8_t
{
kInteger,
kUnsignedInteger,
kString,
kCustom,
};
Type type;
union
{
int64_t integer;
uint64_t unsigned_integer;
StringView string;
CustomFormatter custom;
};
constexpr explicit FormatArg(std::signed_integral auto value) :
type{kInteger},
integer{value}
{}
constexpr explicit FormatArg(std::unsigned_integral auto value) :
type{kUnsignedInteger},
unsigned_integer{value}
{}
constexpr explicit FormatArg(StringView value) :
type{kString},
string{value}
{}
template<typename T>
constexpr explicit FormatArg(const T& payload, CustomFormatter::Callback callback) :
type{kCustom},
custom{CustomFormatter{&payload, callback}}
{}
};
template<typename T>
deimos::FormatArg DeimosMakeFormatArg(T&& value)
requires std::is_constructible_v<deimos::FormatArg, T>
{
return deimos::FormatArg(value);
}
template<typename T>
concept Formattable = std::same_as<deimos::FormatArg, decltype(DeimosMakeFormatArg(std::declval<T>()))>;
void FormatVa(IWriter*, gsl::czstring fmt, Span<const FormatArg>);
template<Formattable... Args>
void Format(IWriter* writer, gsl::czstring fmt, Args&&... args)
{
FormatVa(writer, fmt, { DeimosMakeFormatArg(std::forward<Args>(args))... });
}
} // namespace deimos
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