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# Copyright 2017 Rene Rivera
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)

# Feature that allows us to configure the maximal template instantiation depth
# level allowed by a C++ compiler. Applies only to C++ toolsets whose compilers
# actually support this configuration setting.
#
# Note that Boost Build currently does not allow defining features that take any
# positive integral value as a parameter, which is what we need here, so we just
# define some of the values here and leave it up to the user to extend this set
# as he needs using the feature.extend rule.
#
# TODO: This should be upgraded as soon as Boost Build adds support for custom
# validated feature values or at least features allowing any positive integral
# value. See related Boost Build related trac ticket #194.
#

import feature ;
import numbers ;

feature.feature c++-template-depth
    :
        [ numbers.range 64 1024 : 64 ]
        [ numbers.range 20 1000 : 10 ]
        # Maximum template instantiation depth guaranteed for ANSI/ISO C++
        # conforming programs.
        17
    :
        incidental optional propagated ;