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# ticket: 3293
# mode: run
# tag: cpp, cpp17, werror
from cython.operator cimport dereference as deref
from libcpp.optional cimport optional, nullopt, make_optional
from libcpp.string cimport string
from libcpp.pair cimport pair
def simple_test():
"""
>>> simple_test()
"""
cdef optional[int] o
assert(not o.has_value())
o = 5
assert(o.has_value())
assert(o.value()==5)
o.reset()
assert(not o.has_value())
def operator_test():
"""
>>> operator_test()
"""
cdef optional[int] o1, o2
# operator bool
assert(not o1)
o1 = 5
assert(o1)
# operator *
assert(deref(o1) == 5)
# operator =,==,!=,>,<,>=,<=
assert(not o1 == o2)
assert(o1 != o2)
o2 = o1
assert(o1 == o2)
assert(not o1 > o2)
assert(not o1 < o2)
assert(o1 >= o2)
assert(o1 <= o2)
# operators =,== for other types (all related operators are identical)
o1 = 6
assert(o1 == 6)
o2 = nullopt
assert(o2 == nullopt)
def misc_methods_test():
"""
>>> misc_methods_test()
"""
# make_optional
cdef optional[int] o
o = make_optional[int](5)
assert(o == 5)
# swap
o.swap(optional[int](6))
assert(o == 6)
# emplace
cdef optional[pair[int,int]] op
cdef pair[int,int]* val_ptr = &op.emplace(1,2)
assert(op.has_value())
assert(op.value() == pair[int,int](1,2))
assert(&op.value() == val_ptr) # check returned reference
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