| 68 | }; |
| 69 | |
| 70 | int main() |
| 71 | { |
| 72 | chaiscript::ChaiScript chai; |
| 73 | chai.add(chaiscript::fun(&BaseClass::doSomething), "doSomething"); |
| 74 | chai.add(chaiscript::fun(&BaseClass::setValue), "setValue"); |
| 75 | chai.add(chaiscript::fun(&BaseClass::getValue), "getValue"); |
| 76 | chai.add(chaiscript::constructor<ChaiScriptDerived (const std::vector<chaiscript::Boxed_Value> &)>(), "ChaiScriptDerived"); |
| 77 | chai.add(chaiscript::base_class<BaseClass, ChaiScriptDerived>()); |
| 78 | chai.add(chaiscript::user_type<BaseClass>(), "BaseClass"); |
| 79 | chai.add(chaiscript::user_type<ChaiScriptDerived>(), "ChaiScriptDerived"); |
| 80 | |
| 81 | std::string script = R""( |
| 82 | def MakeDerived() { |
| 83 | return ChaiScriptDerived( |
| 84 | // create a dynamically created array and pass it in to the constructor |
| 85 | [ |
| 86 | fun(this, f, d) { |
| 87 | // see here that we are calling back into the 'this' pointer |
| 88 | return "${this.getValue()}${f * d}"; |
| 89 | }, |
| 90 | |
| 91 | fun(this, new_val) { |
| 92 | if (new_val.size() < 5) { |
| 93 | true; |
| 94 | } else { |
| 95 | print("String ${new_val} is too long"); |
| 96 | false; |
| 97 | } |
| 98 | } |
| 99 | ] |
| 100 | ); |
| 101 | } |
| 102 | |
| 103 | var myderived := MakeDerived(); // avoid a copy by using reference assignment := |
| 104 | |
| 105 | )""; |
| 106 | |
| 107 | chai.eval(script); |
| 108 | |
| 109 | BaseClass &myderived = chai.eval<ChaiScriptDerived&>("myderived"); |
| 110 | |
| 111 | // at this point in the code myderived is both a ChaiScript variable and a C++ variable. In both cases |
| 112 | // it is a derivation of BaseClass, and the implementation is provided via ChaiScript functors |
| 113 | // assigned in the MakeDerived() factory function |
| 114 | // |
| 115 | // Notice that our validateValue() function has a requirement that the new string be < 5 characters long |
| 116 | |
| 117 | myderived.setValue("1234"); |
| 118 | assert(myderived.getValue() == "1234"); |
| 119 | |
| 120 | // chaiscript defined function will print out an error message and refuse to allow the setting |
| 121 | myderived.setValue("12345"); |
| 122 | assert(myderived.getValue() == "1234"); |
| 123 | |
| 124 | |
| 125 | chai.eval(R"(myderived.setValue("new"))"); // set the value via chaiscript |
| 126 | assert(myderived.getValue() == "new"); |
| 127 | |