string_view_ops.hpp

// Copyright (C) 2022 by Camden Mannett.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "arg_router/basic_types.hpp"
 
#include <string_view>
 
namespace arg_router::utility::string_view_ops
{
template <typename CharT,
          typename Traits = std::char_traits<CharT>,
          typename Allocator = config::allocator<CharT>>
[[nodiscard]] constexpr std::basic_string<CharT, Traits, Allocator> operator+(
    std::basic_string<CharT, Traits, Allocator> lhs,
    std::basic_string_view<CharT, Traits> rhs)
{
    return lhs += rhs;
}
 
template <typename CharT,
          typename Traits = std::char_traits<CharT>,
          typename Allocator = config::allocator<CharT>>
[[nodiscard]] constexpr std::basic_string<CharT, Traits, Allocator> operator+(
    std::basic_string_view<CharT, Traits> lhs,
    std::basic_string<CharT, Traits, Allocator> rhs)
{
    rhs.insert(rhs.begin(), lhs.begin(), lhs.end());
    return rhs;
}
 
template <typename CharT, typename Traits = std::char_traits<CharT>>
[[nodiscard]] constexpr std::basic_string<CharT, Traits, config::allocator<CharT>> operator+(
    std::basic_string_view<CharT, Traits> lhs,
    std::basic_string_view<CharT, Traits> rhs)
{
    return std::basic_string<CharT, Traits, config::allocator<CharT>>{lhs} += rhs;
}
}  // namespace arg_router::utility::string_view_ops