/*
* empty_string.h
*
* Copyright (C) 2018 OpenCog Foundation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License v3 as
* published by the Free Software Foundation and including the exceptions
* at http://opencog.org/wiki/Licenses
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, write to:
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/**
* The sole purpose of this file is to provide a static empty
* std::string, to be used as a default function initializer.
* This allows gdb to call those functions, as otherwise gdb is
* not able to allocate an empty string.
*
* Example usage:
* int foo(std::string = ""); // BAD gdb cannot call this!
* int foo(std::string = empty_string); // GOOD gdb can call this.
*/
#include <string>
#ifndef _OPENCOG_EMPTY_STRING_H_
#define _OPENCOG_EMPTY_STRING_H_
namespace opencog {
// Empty static string. This is mostly to make oc_to_string and poc
// (see
// https://wiki.opencog.org/w/Development_standards#Pretty_Print_OpenCog_Objects)
// easier to define.
static inline const std::string empty_string = "";
// Default indentation for oc_to_string when there is some.
static inline const std::string oc_to_string_indent = " ";
} // ~namespace opencog
#endif