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Updated cheatsheet.md for latest namespace implementation

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Stephen Berry 2017-09-05 13:47:53 -05:00
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cheatsheet.md
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@ -168,37 +168,21 @@ chai.set_global(chaiscript::var(somevar), "somevar"); // global non-const, overw
## Adding Namespaces
Namespaces will not be populated until `import` is called.
This saves memory and computing costs if a namespace is not imported into every ChaiScript instance.
```
chaiscript::Namespace math;
chai.register_namespace([](chaiscript::Namespace& math) {
math["pi"] = chaiscript::const_var(3.14159);
math["sin"] = chaiscript::var(chaiscript::fun([](const double x) { return sin(x); }));
chai.register_namespace(math, "math");
math["sin"] = chaiscript::var(chaiscript::fun([](const double x) { return sin(x); })); },
"math");
```
Import namespace via C++ (_not generally recommended_)
```
chai.import("math");
```
Import namespace via ChaiScript (_recommended_)
Import namespace in ChaiScript
```
import("math")
print(math.pi) // prints 3.14159
```
#### Delayed Namespace Generation
Passing a lambda function that returns a namespace will delay the namespace generation until `import` is called.
This saves memory and computing costs if a namespace is not imported into every ChaiScript instance.
```
chai.register_namespace([]() {
chaiscript::Namespace math;
math["pi"] = chaiscript::const_var(3.14159);
math["sin"] = chaiscript::var(chaiscript::fun([](const double x) { return sin(x); }));
return math; },
"math");
```
# Using STL
ChaiScript recognize many types from STL, but you have to add specific instantiation yourself.