TimespanLiterals.h

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/** @noop License Comment
 *  @file
 *  @copyright
 *  This Source Code is subject to the terms of the Mozilla Public License, v2.0.
 *  If a copy of the MPL was not distributed with this file You can obtain one at
 *  https://mozilla.org/MPL/2.0/
 *  
 *  @author David Mórász
 *  @date 2025
 */
 
#pragma once
#include "CoreMinimal.h"
#include "Mcro/Concepts.h"
#include "Misc/Timespan.h"
 
namespace Mcro::Timespan::Literals
{
    using namespace Mcro::Concepts;
 
    namespace Detail
    {
        template <auto Function, char... ValueText>
        constexpr FTimespan CreateFromParamPack()
        {
            static TStaticArray<char, sizeof...(ValueText) + 1> string { ValueText..., '\0' };
            double value = TCString<char>::Atod(string.GetData());
            return Function(value);
        }
    }
    
    template <char... Value>
    constexpr FTimespan operator ""_D ()
    {
        return Detail::CreateFromParamPack<&FTimespan::FromDays, Value...>();
    }
    
    template <char... Value>
    constexpr FTimespan operator ""_h ()
    {
        return Detail::CreateFromParamPack<&FTimespan::FromHours, Value...>();
    }
    
    template <char... Value>
    constexpr FTimespan operator ""_m ()
    {
        return Detail::CreateFromParamPack<&FTimespan::FromMinutes, Value...>();
    }
    
    template <char... Value>
    constexpr FTimespan operator ""_s ()
    {
        return Detail::CreateFromParamPack<&FTimespan::FromSeconds, Value...>();
    }
    
    template <char... Value>
    constexpr FTimespan operator ""_ms ()
    {
        return Detail::CreateFromParamPack<&FTimespan::FromMilliseconds, Value...>();
    }
    
    template <char... Value>
    constexpr FTimespan operator ""_us ()
    {
        return Detail::CreateFromParamPack<&FTimespan::FromMicroseconds, Value...>();
    }
}