Question 1

How do I parse a TOML file with toml++ in C++?

Accepted Answer

Include toml.hpp and use toml::parse_file("filename.toml") to get a toml::table object. You can access values with config["key"].value_or(default) and iterate using ranged-for loops or visitors, as shown in the basic usage example.

Question 2

toml++ vs toml11: which is better for my project?

Accepted Answer

toml++ is header-only and fully TOML v1.0.0 compliant with JSON/YAML serialization, while toml11 is also popular but may have a different API style. Choose toml++ if you need multi-format output and modern C++17 features, or toml11 for potentially lighter weight in some cases.

Question 3

Does toml++ support C++20 modules?

Accepted Answer

Yes, toml++ has experimental module support. You can enable it by adding the modules directory to your include paths and setting TOMLPLUSPLUS_BUILD_MODULES, then use import tomlplusplus; instead of #include.

Question 4

How to disable exceptions in toml++?

Accepted Answer

Set the preprocessor define TOML_EXCEPTIONS to 0 before including toml++. This configures the library to work in exception-free environments, using error codes or alternatives for error handling.

Question 5

What's the performance of toml++ compared to cpptoml?

Accepted Answer

toml++ is designed for performance with a modern C++ API and passes compliance tests, but specific benchmarks aren't in the README. It's likely efficient due to zero-overhead abstractions, though header-only may affect compile times versus compiled libraries.

Question 6

Can toml++ handle large or nested TOML files?

Accepted Answer

Yes, it supports deeply nested structures and has fixes for stack overflow issues, as noted in the contributors list. However, performance may vary based on configuration, and disabling parsers/formatters can optimize size.

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