toml11/docs/content.en/docs/reference/into.md

+++ title = "into.hpp" type = "docs" +++

into.hpp

Defines a struct used for conversion from user-defined types into toml::value constructors.

You can achieve the same functionality by adding an into_toml member function, but for classes where you cannot add member functions, use into<T>.

This file does not provide specific implementations. Please specialize this struct when using.

namespace toml
{

template<typename T>
struct into;

} // toml

Example

namespace extlib
{
struct foo
{
    int a;
    std::string b;
};
} // extlib

#include <toml11/into.hpp>

namespace toml
{
template<>
struct into<extlib::foo>
{
    template<typename TC>
    static toml::basic_value<TC> into_toml(const extlib::foo& f)
    {
        using value_type = toml::basic_value<TC>;
        using table_type = typename value_type::table_type;
        return value_type(table_type{{"a", f.a}, {"b", f.b}});
    }
};
} // toml

Related

• [conversion.hpp]({{<ref "conversion.md">}})
• [from.hpp]({{<ref "from.md">}})