#### basic_system_executor::require

Obtain an executor with the `blocking.possibly` property.

    basic_system_executor< execution::blocking_t::possibly_t, Relationship, Allocator > require(
        execution::blocking_t::possibly_t ) const;
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Obtain an executor with the `blocking.always` property.

    basic_system_executor< execution::blocking_t::always_t, Relationship, Allocator > require(
        execution::blocking_t::always_t ) const;
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Obtain an executor with the `blocking.never` property.

    basic_system_executor< execution::blocking_t::never_t, Relationship, Allocator > require(
        execution::blocking_t::never_t ) const;
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Obtain an executor with the `relationship.continuation` property.

    basic_system_executor< Blocking, execution::relationship_t::continuation_t, Allocator > require(
        execution::relationship_t::continuation_t ) const;
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Obtain an executor with the `relationship.fork` property.

    basic_system_executor< Blocking, execution::relationship_t::fork_t, Allocator > require(
        execution::relationship_t::fork_t ) const;
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Obtain an executor with the specified `allocator` property.

    template<
        typename OtherAllocator>
    basic_system_executor< Blocking, Relationship, OtherAllocator > require(
        execution::allocator_t< OtherAllocator > a) const;
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Obtain an executor with the default `allocator` property.

    basic_system_executor< Blocking, Relationship, std::allocator< void > > require(
        execution::allocator_t< void > ) const;
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