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55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
#pragma once
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#include <llarp/util/buffer.hpp>
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#include <string_view>
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#include <type_traits>
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#include <cstddef>
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#include <iosfwd>
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namespace llarp
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{
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// Buffer printer lets you print a string as a nicely formatted buffer with a hex breakdown and
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// visual representation of the data for logging purposes. Wraps the string data with a object
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// that prints the buffer format during output; use as:
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//
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// out << buffer_printer(my_buffer);
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//
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struct buffer_printer
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{
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std::basic_string_view<std::byte> buf;
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// Constructed from any type of string_view<T> for a single-byte T (char, std::byte, uint8_t,
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// etc.)
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template <typename T, typename = std::enable_if_t<sizeof(T) == 1>>
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explicit buffer_printer(std::basic_string_view<T> buf)
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: buf{reinterpret_cast<const std::byte*>(buf.data()), buf.size()}
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{}
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// Constructed from any type of lvalue string<T> for a single-byte T (char, std::byte, uint8_t,
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// etc.)
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template <typename T, typename = std::enable_if_t<sizeof(T) == 1>>
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explicit buffer_printer(const std::basic_string<T>& buf)
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: buffer_printer(std::basic_string_view<T>{buf})
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{}
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// *Not* constructable from a string<T> rvalue (because we only hold a view and do not take
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// ownership).
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template <typename T, typename = std::enable_if_t<sizeof(T) == 1>>
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explicit buffer_printer(std::basic_string<T>&& buf) = delete;
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// Constructable from a (T*, size) argument pair, for byte-sized T's.
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template <typename T, typename = std::enable_if_t<sizeof(T) == 1>>
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explicit buffer_printer(const T* data, size_t size)
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: buffer_printer(std::basic_string_view<T>{data, size})
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{}
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// llarp_buffer_t printer:
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explicit buffer_printer(const llarp_buffer_t& buf)
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: buffer_printer(std::basic_string_view<byte_t>{buf.base, buf.sz})
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{}
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};
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std::ostream&
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operator<<(std::ostream& o, const buffer_printer& bp);
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} // namespace llarp
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