綁定C++函數和類至V8 JavaScript引擎：v8pp

綁定C++函數和類至V8 JavaScript引擎：v8pp。這個已經在下環境測度過：

• Microsoft Visual C++ 2013 (Windows 7/8)
• GCC 4.8.1 (Ubuntu 13.10 with Linux kernel 3.11.0)
• Clang 3.5 (Mac OS X 10.2)
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綁定示例


v8pp supports V8 versions after 3.21 withv8::Isolateusage in API. There are 2 targets for binding:

• v8pp::module, a wrapper class aroundv8::ObjectTemplate
• v8pp::class_, a template class wrapper aroundv8::FunctionTemplate

Both of them require a pointer tov8::Isolateinstance. They allows to bind from C++ code such items as variables, functions, constants with a functionset(name, item):

v8::Isolate* isolate;

int var;
int get_var() { return var + 1; }
void set_var(int x) { var = x + 1; }

struct X
{
    X(int v, bool u) : var(v) {}
    int var;
    int get() const { return var; }
    voi set(int x) { var = x; } 
};

// bind free variables and functions
v8pp::module mylib(isolate);
mylib
    // set read-only attribute
    .set_const("PI", 3.1415)
    // set variable available in JavaScript with name `var`
    .set("var", var)
    // set function get_var as `fun`
    .set("fun", &get_var)
    // set property `prop` with getter get_var() and setter set_var()
    .set("prop", property(get_var, set_var))

// bind class
v8pp::class_<X> X_class(isolate);
X_class
    // specify X constructor signature
    .ctor<int, bool>()
    // bind variable
    .set("var", &X::var)
    // bind function
    .set("fun", &X::set)
    // bind read-only property
    .set("prop", property(&X::get))

// set class into the module template
mylib.set("X", X_class);

// set bindings in global object as `mylib`
isolate->GetCurrentContext()->Global()->Set(
    v8::String::NewFromUtf8(isolate, "mylib"), mylib.new_instance());




經上述綁定之后，就可以在JavaScript中使用:

mylib.var = mylib.PI + mylib.fun();
var x = new mylib.X(1, true);
mylib.prop = x.prop +x.fun();




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