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| 1 | /* |
| 2 | * opencog/atoms/flow/LiteralValueOfLink.h |
| 3 | * |
| 4 | * Copyright (C) 2018 Linas Vepstas |
| 5 | * All Rights Reserved |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU Affero General Public License v3 as |
| 9 | * published by the Free Software Foundation and including the exceptions |
| 10 | * at http://opencog.org/wiki/Licenses |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Affero General Public License |
| 18 | * along with this program; if not, write to: |
| 19 | * Free Software Foundation, Inc., |
| 20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 21 | */ |
| 22 | |
| 23 | #ifndef _OPENCOG_LITERAL_VALUE_OF_LINK_H |
| 24 | #define _OPENCOG_LITERAL_VALUE_OF_LINK_H |
| 25 | |
| 26 | #include <opencog/atoms/flow/ValueOfLink.h> |
| 27 | |
| 28 | namespace opencog |
| 29 | { |
| 30 | /** \addtogroup grp_atomspace |
| 31 | * @{ |
| 32 | */ |
| 33 | |
| 34 | /// The LiteralValueOfLink returns the value on the indicated atom |
| 35 | /// (first argument) at the indicated key (second argument). The |
| 36 | /// literal value is returned; that value is NOT executed. |
| 37 | /// |
| 38 | class LiteralValueOfLink : public ValueOfLink |
| 39 | { |
| 40 | private: |
| 41 | void init(void); |
| 42 | |
| 43 | public: |
| 44 | LiteralValueOfLink(const HandleSeq&&, Type=LITERAL_VALUE_OF_LINK); |
| 45 | |
| 46 | LiteralValueOfLink(const LiteralValueOfLink&) = delete; |
| 47 | LiteralValueOfLink& operator=(const LiteralValueOfLink&) = delete; |
| 48 | |
| 49 | // Return a pointer to the value at the specified key. |
| 50 | virtual ValuePtr execute(AtomSpace*, bool); |
| 51 | |
| 52 | static Handle factory(const Handle&); |
| 53 | }; |
| 54 | |
| 55 | LINK_PTR_DECL(LiteralValueOfLink) |
| 56 | #define createLiteralValueOfLink CREATE_DECL(LiteralValueOfLink) |
| 57 | |
| 58 | /** @}*/ |
| 59 | } |
| 60 | |
| 61 | #endif // _OPENCOG_LITERAL_VALUE_OF_LINK_H |