BloombergLP::bslstl::Variant_Function::functionImpl

Invoke visitor on the active alternative of variant.

Synopsis

Declared in <bslstl_variant.h>

static
t_RET
functionImpl(
    t_VISITOR&& visitor,
    t_VARIANT&& variant);

Description

This component‐private function invokes the specified visitor with the active alternative object of the specified variant and implicitly converts the return type to (template parameter) t_RET. The pre‐C++17 implementation is limited to invocations of the form visitor(variant). The behavior is undefined unless (template parameter) t_INDEX is the index of the active alternative.

Return Value

result of invoking visitor, converted to t_RET

Parameters

Name

Description

visitor

callable to invoke on the active alternative

variant

variant whose active alternative is visited

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