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ax_cxx_delete_method.m4
# =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_cxx_delete_method.html # =========================================================================== # # SYNOPSIS # # AX_CXX_DELETE_METHOD # # DESCRIPTION # # Check whether the C++11 '= delete' syntax, for suppressing undesired # implicit methods, is supported. If it is, the macro DELETE_METHOD is # defined to '= delete'; otherwise it is defined to nothing. Thus, you # can write # # class foo { # ... # private: # foo(foo const&) DELETE_METHOD; # }; # # to delete the 'foo' copy constructor or fall back to the idiom of a # private undefined method if the compiler doesn't support this. # # Does not test '= delete' on a template specialization. Does not ensure # that the compiler is in C++11 mode. # # LICENSE # # Copyright (c) 2012 Zack Weinberg <zackw@panix.com> # # 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 2 AC_DEFUN([AX_CXX_DELETE_METHOD], [dnl AC_LANG_ASSERT([C++]) # This compilation should succeed... AC_CACHE_CHECK(whether $CXX accepts method deletion, ax_cv_cxx_delete_method_syntax, [ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ struct foo { foo(double); foo(int) = delete; }; extern void t(foo const&); void tt(double n) { t(n); } ]])], [ax_cv_cxx_delete_method_syntax=yes], [ax_cv_cxx_delete_method_syntax=no])]) # ... and this one should fail. AC_CACHE_CHECK(whether $CXX enforces method deletion, ax_cv_cxx_delete_method_enforced, [ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ struct foo { foo(double); foo(int) = delete; }; extern void t(foo const&); void tt(int n) { t(n); } ]])], [ax_cv_cxx_delete_method_enforced=no], [ax_cv_cxx_delete_method_enforced=yes])]) if test $ax_cv_cxx_delete_method_syntax = yes && test $ax_cv_cxx_delete_method_enforced = yes then AC_DEFINE([DELETE_METHOD], [= delete], [Define as `= delete' if your compiler supports C++11 method deletion, as nothing otherwise.]) else AC_DEFINE([DELETE_METHOD], [], [Define as `= delete' if your compiler supports C++11 method deletion, as nothing otherwise.]) fi ])