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# ===============================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cxx_erase_iterator_type.html
# ===============================================================================
#
# SYNOPSIS
#
# AX_CXX_ERASE_ITERATOR_TYPE
#
# DESCRIPTION
#
# If the compiler supports define erase with constant iterator or with
# classical iterator.
#
# Define autoconfigured_erase_iterator to const_iterator if supported and
# iterator if not supported.
#
# Define HAVE_ERASE_CONSTANT_ITERATOR if supported
#
# LICENSE
#
# Copyright (c) 2015 Bastien ROUCARIES
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 3
AC_DEFUN([AX_CXX_ERASE_ITERATOR_TYPE],
[dnl
AC_CACHE_CHECK([the type of iterator inside erase function],
ax_cv_cxx_erase_iterator_type,
[dnl
AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([dnl
AC_LANG_PROGRAM([
#include <vector>
typedef std::vector<int> intvector;
struct myvector {
myvector() { v.push_back(1); }
typedef intvector::const_iterator const_iterator;
typedef intvector::iterator iterator;
iterator erase (const_iterator position)
{ return v.erase(position); };
iterator erase (const_iterator first, const_iterator last)
{ return v.erase(first,last); };
intvector v;
};
],
[myvector v;
v.erase(v.v.begin(),v.v.end());
return 1;
])],
ax_cv_cxx_erase_iterator_type="const_iterator",
ax_cv_cxx_erase_iterator_type="iterator")
AC_LANG_POP([C++])
])
AS_IF([test "X$ax_cv_cxx_erase_iterator_type" = Xconst_iterator],
[AC_DEFINE(HAVE_ERASE_CONSTANT_ITERATOR,,[define if the compiler supports iterator erase(const_iterator position)])])
AH_VERBATIM([autoconfigured_erase_iterator],
[/* Define to the keyword(s) used to specify the type of the
erase iterator. Define to const_iterator if constant
or iterator if not constant. */
#undef autoconfigured_erase_iterator
])
AC_DEFINE_UNQUOTED([autoconfigured_erase_iterator],
[$ax_cv_cxx_erase_iterator_type],
[iterator type for erase])
])
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