How to use FunSpec.overriding? in KotlinPoet

问题

Submitted by Fleshgrinder on GitHub.

The FunSpec class has the very handy overriding method, however, it is unclear how this can be used while generating code.

Minimal example:

FileSpec.builder("com.fleshgrinder", "KotlinPoet").apply {
    val className = ClassName("com.fleshgrinder", "KotlinPoet")
    addType(TypeSpec.classBuilder(className).apply {
        addFunction(FunSpec.builder("toString").apply {
            addModifiers(KModifier.OVERRIDE)
            addStatement("""return "KotlinPoet"""")
        }.build())
    }.build())
}.build().writeTo(System.out)

Which generates:

class KotlinPoet {
    override fun toString() = "KotlinPoet"
}

The output it generates is perfect but the code to generate it is not.

FunSpec.overriding(Any::toString).apply {
    addStatement("""return "KotlinPoet"""")
}.build()

来源：https://stackoverflow.com/questions/50296204/how-to-use-funspec-overriding-in-kotlinpoet