named-tuple

Single header implementation a named-tuple in C++

Tuples have always been addressible via index and type -- the obvious gap here is accessing by name. This (small) header-only library provides just that!

Usage

auto make_config() {
    using Configuration = named_tuple<
      named_val<std::string, "install-path">,
      named_val<std::string, "build-path">,
      named_val<int, "retry-limit">,
      named_val<bool, "system-wide">
    >;

    Configuration default_config{"/usr/local/", "./build", 1, true};
    return default_config;
}

void use_config(auto&& config) {
    // named_get supports multiple values and will construct an intermediate named_tuple
    auto build_options = named_get<"build-path", "retry-limit">;
    auto install_options = named_get<"install-path", "system-wide">;
}

Components

• named_tuple: The tuple class - sizeof(named_tuple) == sizeof(tuple)
• named_val: descriptor used to indicate the type and name
• named_get<"name">: accessor for retrieving a value stored in the named_tuple
• named_get<names...>: accessor for splicing a named_tuple. You can even permute!
• named_tie<names...>: std::tie() equivalent for named_tuple

Limitations

• Deduction guides are not really feasible due to their limitation of needing all template arguments specified.
• I have not extensively tested the reference semantics and behavior. I welcome contributions to this library.

Compiler support

Requires a small subset of C++20 features.

Tested on:

• Linux
  • g++ 13.0
  • clang 16.0
• macOS
  • g++ 13.0
  • clang 16.0
  • AppleClang 14.0

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To the extent possible under law, Will Killian has waived all copyright and related or neighboring rights to the expected library. This work is published from: the United States of America.