Query the current value of the blocking property.

static constexpr execution::blocking_t query(
    execution::blocking_t );
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Query the current value of the relationship property.

static constexpr execution::relationship_t::continuation_t query(
    execution::relationship_t );
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Query the current value of the inline_exception_handling property.

static constexpr execution::inline_exception_handling_t query(
    execution::inline_exception_handling_t );
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