////
Copyright 2019 Peter Dimov
Distributed under the Boost Software License, Version 1.0.
http://www.boost.org/LICENSE_1_0.txt
////

[#reference]
# Reference
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[#synopsis]
## <boost/throw_exception.hpp> Synopsis

```
#include <boost/assert/source_location.hpp>
#include <boost/config.hpp>
#include <exception>

namespace boost
{

#if defined( BOOST_NO_EXCEPTIONS )

BOOST_NORETURN void throw_exception( std::exception const & e ); // user defined

BOOST_NORETURN void throw_exception( std::exception const & e,
  boost::source_location const & loc ); // user defined

#else

template<class E> BOOST_NORETURN void throw_exception( E const & e );

template<class E> BOOST_NORETURN void throw_exception( E const & e,
  boost::source_location const & loc );

#endif

} // namespace boost

#define BOOST_THROW_EXCEPTION(x) \
  ::boost::throw_exception(x, BOOST_CURRENT_LOCATION)
```

## throw_exception

```
#if defined( BOOST_NO_EXCEPTIONS )

BOOST_NORETURN void throw_exception( std::exception const & e ); // user defined

#else

template<class E> BOOST_NORETURN void throw_exception( E const & e );

#endif
```

Requires: :: `E` must have `std::exception` as a public and unambiguous base
  class.

Effects: ::
  * When exceptions aren't available, the function is declared, but
    not defined. The user is expected to supply an appropriate definition.
  * Otherwise, if `BOOST_EXCEPTION_DISABLE` is defined, the function
    throws `e`.
  * Otherwise, the function throws an object of a type derived from `E`,
    derived from `boost::exception`, if `E` doesn't already derive from
    it, and containing the necessary support for `boost::exception_ptr`.

```
#if defined( BOOST_NO_EXCEPTIONS )

BOOST_NORETURN void throw_exception( std::exception const & e,
  boost::source_location const & loc ); // user defined

#else

template<class E> BOOST_NORETURN void throw_exception( E const & e,
  boost::source_location const & loc );

#endif
```

Requires: :: `E` must have `std::exception` as a public and unambiguous base
  class.

Effects: ::
  * When exceptions aren't available, the function is declared, but
    not defined. The user is expected to supply an appropriate definition.
  * Otherwise, if `BOOST_EXCEPTION_DISABLE` is defined, the function
    throws `e`.
  * Otherwise, the function throws an object of a type derived from `E`,
    derived from `boost::exception`, if `E` doesn't already derive from
    it, and containing the necessary support for `boost::exception_ptr`. The
    `boost::exception` base class is initialized to contain the source
    location `loc`.