Retrieve an integral configuration value.

template<
    typename T>
constraint_t< is_integral< T >::value, T > get(
    const char * section,
    const char * key_name,
    T default_value) const;
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Retrieve a string configuration value.

const char * get(
    const char * section,
    const char * key_name,
    const char * default_value,
    char * value,
    std::size_t value_len) const;
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Retrieve a string configuration value into a character array.

template<
    std::size_t N>
const char * get(
    const char * section,
    const char * key_name,
    const char * default_value,
    char((&value)[N]) const;
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