2010-10-13  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/bits/random.h (discrete_distribution<>::param_type::
	param_type()): Default construct the vectors.
	(discrete_distribution<>::param_type::probabilities): Adjust.
	(discrete_distribution<>::probabilities): Likewise.
	(discrete_distribution<>::max): Likewise.
	(piecewise_constant_distribution<>::param_type::
	param_type()): Default construct the vectors.
	(piecewise_constant_distribution<>::param_type::intervals): Adjust.
	(piecewise_constant_distribution<>::param_type::densities): Likewise.
	(piecewise_constant_distribution<>::intervals): Likewise.
	(piecewise_constant_distribution<>::densities): Likewise.
	(piecewise_constant_distribution<>::min): Likewise.
	(piecewise_constant_distribution<>::max): Likewise.
	(piecewise_linear_distribution<>::param_type::
	param_type()): Default construct the vectors.
	(piecewise_linear_distribution<>::param_type::intervals): Adjust.
	(piecewise_linear_distribution<>::param_type::densities): Likewise.
	(piecewise_linear_distribution<>::intervals): Likewise.
	(piecewise_linear_distribution<>::densities): Likewise.
	(piecewise_linear_distribution<>::min): Likewise.
	(piecewise_linear_distribution<>::max): Likewise.
	* include/bits/random.tcc (discrete_distribution<>::param_type::
	_M_initialize): Deal quickly with raw _M_prob equivalent to
	a default constructed param_type, just clear the vector.
	(discrete_distribution<>::operator()): Early return 0 for a
	default constructed distribution.
	(piecewise_constant_distribution<>::param_type::_M_initialize):
	Likewise for _M_int and _M_den.
	(piecewise_constant_distribution<>::operator()): Early return
	for a default constructed distribution.
	(piecewise_linear_distribution<>::param_type::_M_initialize):
	Likewise.
	(piecewise_linear_distribution<>::operator()): Early return
	for a default constructed distribution.
	* testsuite/26_numerics/random/discrete_distribution/operators/
	call-default.cc: New.
	* testsuite/26_numerics/random/piecewise_constant_distribution/
	operators/call-default.cc: Likewise.

From-SVN: r165427