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### Header File Structure

Table 1.10. Top level headers

Header | Contains
--- | ---
cpp_int.hpp | The `cpp_int` backend type.
gmp.hpp | Defines all GMP related backends.
miller_rabin.hpp | Miller Rabin primality testing code.
number.hpp | Defines the `number` backend, is included by all the backend headers.
mpfr.hpp | Defines the mpfr_float_backend backend.
random.hpp | Defines code to interoperate with Boost.Random.
rational_adaptor.hpp | Defines the `rational_adaptor` backend.
cpp_dec_float.hpp | Defines the `cpp_dec_float` backend.
tommath.hpp | Defines the `tommath_int` backend.
concepts/number_archetypes.hpp | Defines a backend concept archetypes for testing use.

Table 1.11. Implementation Headers

Header | Contains
--- | ---
cpp_int/add.hpp | Add and subtract operators for `cpp_int_backend`.
cpp_int/bitwise.hpp | Bitwise operators for `cpp_int_backend`.
cpp_int/checked.hpp | Helper functions for checked arithmetic for `cpp_int_backend`.
cpp_int/comparison.hpp | Comparison operators for `cpp_int_backend`.
cpp_int/cpp_int_config.hpp | Basic setup and configuration for `cpp_int_backend`.
cpp_int/divide.hpp | Division and modulus operators for `cpp_int_backend`.
cpp_int/limits.hpp | `numeric_limits` support for `cpp_int_backend`.
cpp_int/misc.hpp | Miscellaneous operators for `cpp_int_backend`.
cpp_int/multiply.hpp | Multiply operators for `cpp_int_backend`.
detail/default_ops.hpp | Default versions of the optional backend non-member functions.
detail/generic_interconvert.hpp | Generic interconversion routines.
detail/number_base.hpp | All the expression template code, metaprogramming, and operator overloads for `number`.
detail/no_et_ops.hpp | The non-expression template operators.
detail/functions/constants.hpp | Defines constants used by the floating-point functions.
detail/functions/pow.hpp | Defines default versions of the power and exponential related floating-point functions.
detail/functions/trig.hpp | Defines default versions of the trigonometric related floating-point functions.