✨️ This README is fine, but the toml++ homepage is better. ✨️
- Header-only (optional!)
- Supports the latest TOML release (v1.0.0), plus optional support for some unreleased TOML features
- Passes all tests in the toml-test suite
- Supports serializing to JSON and YAML
- Proper UTF-8 handling (incl. BOM)
- C++17 (plus some C++20 features where available, e.g. experimental support for char8_t strings)
- Doesn't require RTTI
- Works with or without exceptions
- Tested on Clang (8+), GCC (8+) and MSVC (VS2019)
- Tested on x64, x86 and ARM
ℹ️ The following example favours brevity. If you'd prefer full API documentation and lots of specific code snippets instead, visit the project homepage
Given a TOML file configuration.toml containing the following:
[library]
name = "toml++"
authors = ["Mark Gillard <[email protected]>"]
[dependencies]
cpp = 17Reading it in C++ is easy with toml++:
#include <toml.hpp>
auto config = toml::parse_file( "configuration.toml" );
// get key-value pairs
std::string_view library_name = config["library"]["name"].value_or(""sv);
std::string_view library_author = config["library"]["authors"][0].value_or(""sv);
int64_t depends_on_cpp_version = config["dependencies"]["cpp"].value_or(0);
// modify the data
config.insert_or_assign("alternatives", toml::array{
"cpptoml",
"toml11",
"Boost.TOML"
});
// use a visitor to iterate over heterogenous data
config.for_each([](auto& key, auto& value)
{
std::cout << value << "\n";
if constexpr (toml::is_string<decltype(value)>)
do_something_with_string_values(value);
});
// you can also iterate more 'traditionally' using a ranged-for
for (auto&& [k, v] : config)
{
// ...
}
// re-serialize as TOML
std::cout << config << "\n";
// re-serialize as JSON
std::cout << toml::json_formatter{ config } << "\n";
// re-serialize as YAML
std::cout << toml::yaml_formatter{ config } << "\n";
You'll find some more code examples in the examples directory, and plenty more as part of the API documentation.
toml++ comes in two flavours: Single-header and Regular. The API is the same for both.
- Drop
toml.hppwherever you like in your source tree - There is no step two
- Clone the repository
- Add
tomlplusplus/includeto your include paths #include <toml++/toml.hpp>
Add tomlplusplus/3.4.0 to your conanfile.
Add tomlpp to your package.json5, e.g.:
depends: [
'tomlpp^3.4.0',
]
ℹ️ What is DDS?
tomlplusplus can be easily used in tipi.build projects by adding the following entry to your .tipi/deps:
{
"marzer/tomlplusplus": {}
}vcpkg install tomlplusplus
You can install the wrap with:
meson wrap install tomlplusplus
After that, you can use it like a regular dependency:
tomlplusplus_dep = dependency('tomlplusplus')You can also add it as a subproject directly.
include(FetchContent)
FetchContent_Declare(
tomlplusplus
GIT_REPOSITORY https://github.com/marzer/tomlplusplus.git
GIT_TAG v3.4.0
)
FetchContent_MakeAvailable(tomlplusplus)git submodule add --depth 1 https://github.com/marzer/tomlplusplus.git tomlplusplus
The C++ tooling ecosystem is a fractal nightmare of unbridled chaos so naturally I'm not up-to-speed with all of the available packaging and integration options. I'm always happy to see new ones supported, though! If there's some integration you'd like to see and have the technical know-how to make it happen, feel free to make a pull request.
If you just want to consume toml++ as a regular library then you don't have any dependencies to worry about.
There's a few test-related dependencies to be aware of if you're working on the library, though.
See CONTRIBUTING for information.
A number of configurable options are exposed in the form of preprocessor #defines Most likely you
won't need to mess with these at all, but if you do, set them before including toml++.
| Option | Type | Description | Default |
|---|---|---|---|
TOML_ASSERT(expr) |
function macro | Sets the assert function used by the library. | assert() |
TOML_CALLCONV |
define | Calling convention to apply to exported free/static functions. | undefined |
TOML_CONFIG_HEADER |
string literal | Includes the given header file before the rest of the library. | undefined |
TOML_ENABLE_FORMATTERS |
boolean | Enables the formatters. Set to 0 if you don't need them to improve compile times and binary size. |
1 |
TOML_ENABLE_FLOAT16 |
boolean | Enables support for the built-in _Float16 type. |
per compiler settings |
TOML_ENABLE_PARSER |
boolean | Enables the parser. Set to 0 if you don't need it to improve compile times and binary size. |
1 |
TOML_ENABLE_UNRELEASED_FEATURES |
boolean | Enables support for unreleased TOML language features. | 0 |
TOML_ENABLE_WINDOWS_COMPAT |
boolean | Enables support for transparent conversion between wide and narrow strings. | 1 on Windows |
TOML_EXCEPTIONS |
boolean | Sets whether the library uses exceptions. | per compiler settings |
TOML_EXPORTED_CLASS |
define | API export annotation to add to classes. | undefined |
TOML_EXPORTED_MEMBER_FUNCTION |
define | API export annotation to add to non-static class member functions. | undefined |
TOML_EXPORTED_FREE_FUNCTION |
define | API export annotation to add to free functions. | undefined |
TOML_EXPORTED_STATIC_FUNCTION |
define | API export annotation to add to static functions. | undefined |
TOML_HEADER_ONLY |
boolean | Disable this to explicitly control where toml++'s implementation is compiled (e.g. as part of a library). | 1 |
TOML_IMPLEMENTATION |
define | Define this to enable compilation of the library's implementation when TOML_HEADER_ONLY == 0. |
undefined |
TOML_OPTIONAL_TYPE |
type name | Overrides the optional<T> type used by the library if you need something better than std::optional. |
undefined |
TOML_SMALL_FLOAT_TYPE |
type name | If your codebase has a custom 'small float' type (e.g. half-precision), this tells toml++ about it. | undefined |
TOML_SMALL_INT_TYPE |
type name | If your codebase has a custom 'small integer' type (e.g. 24-bits), this tells toml++ about it. | undefined |
ℹ️ A number of these have ABI implications; the library uses inline namespaces to prevent you from accidentally linking incompatible combinations together.
At any given time the library aims to support whatever the most recently-released version of TOML is, with opt-in support for a number of unreleased features from the TOML master and some sane cherry-picks from the TOML issues list where the discussion strongly indicates inclusion in a near-future release.
The library advertises the most recent numbered language version it fully supports via the preprocessor
defines TOML_LANG_MAJOR, TOML_LANG_MINOR and TOML_LANG_PATCH.
- #516: Allow newlines and trailing commas in inline tables
- #562: Allow hex floating-point values
- #644: Support
+in key names - #671: Local time of day format should support
09:30as opposed to09:30:00 - #687: Relax bare key restrictions to allow additional unicode characters
- #790: Include an
\eescape code sequence (shorthand for\u001B) - #796: Include an
\xHHescape code sequence - #891: Allow non-English scripts for unquoted keys
ℹ️
#define TOML_ENABLE_UNRELEASED_FEATURES 1to enable these features (see Configuration).
All features supported, including:
- #356: Allow leading zeros in the exponent part of a float
- #567: Control characters are not permitted in comments
- #571: Allow raw tabs inside strings
- #665: Make arrays heterogeneous
- #766: Allow comments before commas in arrays
All features supported.
Contributions are very welcome! Either by reporting issues or submitting pull requests. If you wish to submit a pull request, please see CONTRIBUTING for all the details you need to get going.
toml++ is licensed under the terms of the MIT license - see LICENSE.
UTF-8 decoding is performed using a state machine based on Bjoern Hoehrmann's 'Flexible and Economical UTF-8 Decoder'.
- @beastle9end - Made Windows.h include bypass
- @bjadamson - Reported some bugs and helped design a new feature
- @bobfang1992 - Reported a bug and created a wrapper in python
- @GiulioRomualdi - Added cmake+meson support
- @jonestristand - Designed and implemented the
toml::paths feature - @kcsaul - Fixed a bug
- @levicki - Helped design some new features
- @moorereason - Reported a whole bunch of bugs
- @mosra - Created the awesome m.css used to generate the API docs
- @ned14 - Reported a bunch of bugs and helped design some new features
- @okureta - Reported a bug
- @prince-chrismc - Added toml++ to ConanCenter, and fixed some typos
- @rbrugo - Helped design a new feature
- @Reedbeta - Fixed a bug and added additional Visual Studio debugger native visualizers
- @Ryan-rsm-McKenzie - Add natvis file to cmake install script
- @shdnx - Fixed a bug on GCC 8.2.0 and some meson config issues
- @sneves - Helped fix a number of parser bugs
- @sobczyk - Reported some bugs
- @std-any-emplace - Reported some bugs
- @Tachi107 - Made some tweaks to meson.build, added compile_library build option
- @traversaro - Added vcpkg support and reported a bunch of bugs
- @whiterabbit963 - Fixed a bug with value_or conversions
- @ximion - Added support for installation with meson
- @a-is - Fixed a bug -@capuanob - Integrated this project into OSSFuzz
For bug reports and feature requests please consider using the issues system here on GitHub. For anything else though you're welcome to reach out via other means. In order of likely response time:
- Gitter: marzer/tomlplusplus ("Discord for repos")
- Twitter: marzer8789
- Email: [email protected]
- Facebook: marzer
- LinkedIn: marzer