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    I've got a big error from the tests:

    In file included from main.cpp:1:
    In file included from /usr/local/include/igloo/igloo_alt.h:10:
    In file included from /usr/local/include/igloo/igloo_framework.h:22:
    In file included from /usr/local/include/igloo/external/snowhouse/snowhouse.h:4:
    In file included from /usr/local/include/igloo/external/snowhouse/fluent/fluent.h:9:
    In file included from /usr/local/include/igloo/external/snowhouse/fluent/expressionbuilder.h:9:
    In file included from /usr/local/include/igloo/external/snowhouse/fluent/../constraints/constraints.h:11:
    /usr/local/include/igloo/external/snowhouse/fluent/../constraints/equalsconstraint.h:24:26: error: invalid operands to binary expression ('const char' and 'const std::__cxx11::basic_string')
    return (m_expected == actual);
    ~~~~~~~~~~ ^ ~~~~~~
    /usr/local/include/igloo/external/snowhouse/assert.h:126:12: note: in instantiation of function template specialization 'snowhouse::EqualsConstraint::operator()<std::__cxx11::basic_string >' requested here
    if (!expression(actual))
    ^
    /usr/local/include/igloo/external/snowhouse/assert.h:135:7: note: in instantiation of function template specialization 'snowhouse::ConfigurableAssertsnowhouse::DefaultFailureHandler::That<std::__cxx11::basic_string, snowhouse::EqualsConstraint, std::__cxx11::basic_string ()>' requested here
    That(actual, expression, detail::EmptyMessage, file_name, line_number);
    ^
    ./tests.cpp:8:13: note: in instantiation of function template specialization 'snowhouse::ConfigurableAssertsnowhouse::DefaultFailureHandler::That<std::__cxx11::basic_string, snowhouse::EqualsConstraint >' requested here
    Assert::That(triangle(c.first), Equals(c.second));
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/allocator.h:156:7: note: candidate function not viable: no known conversion from 'const char' to 'const std::allocator' for 1st argument
    operator==(const allocator&, const allocator&) _GLIBCXX_NOTHROW
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/system_error:292:3: note: candidate function not viable: no known conversion from 'const char' to 'const std::error_code' for 1st argument
    operator==(const error_code& __lhs, const error_code& __rhs) noexcept
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/system_error:297:3: note: candidate function not viable: no known conversion from 'const char' to 'const std::error_code' for 1st argument
    operator==(const error_code& __lhs, const error_condition& __rhs) noexcept
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/system_error:304:3: note: candidate function not viable: no known conversion from 'const char' to 'const std::error_condition' for 1st argument
    operator==(const error_condition& __lhs, const error_code& __rhs) noexcept
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/system_error:311:3: note: candidate function not viable: no known conversion from 'const char' to 'const std::error_condition' for 1st argument
    operator==(const error_condition& __lhs,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/postypes.h:222:5: note: candidate template ignored: could not match 'fpos' against 'const char'
    operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_pair.h:448:5: note: candidate template ignored: could not match 'pair<type-parameter-0-0, type-parameter-0-1>' against 'const char'
    operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_iterator.h:325:5: note: candidate template ignored: could not match 'reverse_iterator' against 'const char'
    operator==(const reverse_iterator<_Iterator>& __x,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_iterator.h:363:5: note: candidate template ignored: could not match 'reverse_iterator' against 'const char'
    operator==(const reverse_iterator<_IteratorL>& __x,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_iterator.h:886:5: note: candidate template ignored: could not match '__normal_iterator<type-parameter-0-0, type-parameter-0-2>' against 'const char'
    operator==(const __normal_iterator<_IteratorL, _Container>& __lhs,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_iterator.h:893:5: note: candidate template ignored: could not match '__normal_iterator<type-parameter-0-0, type-parameter-0-1>' against 'const char'
    operator==(const __normal_iterator<_Iterator, _Container>& __lhs,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_iterator.h:1139:5: note: candidate template ignored: could not match 'move_iterator' against 'const char'
    operator==(const move_iterator<_IteratorL>& __x,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_iterator.h:1145:5: note: candidate template ignored: could not match 'move_iterator' against 'const char'
    operator==(const move_iterator<_Iterator>& __x,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/ext/new_allocator.h:167:2: note: candidate template ignored: could not match 'new_allocator' against 'basic_string'
    operator==(const new_allocator&, const new_allocator<_Up>&)
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/allocator.h:168:5: note: candidate template ignored: could not match 'allocator' against 'const char'
    operator==(const allocator<_T1>&, const allocator<_T2>&)
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/string_view:473:5: note: candidate template ignored: could not match 'basic_string_view<type-parameter-0-0, type-parameter-0-1>' against 'char'
    operator==(basic_string_view<_CharT, _Traits> __x,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/string_view:479:5: note: candidate template ignored: could not match 'basic_string_view<type-parameter-0-0, type-parameter-0-1>' against 'char'
    operator==(basic_string_view<_CharT, _Traits> __x,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/string_view:485:5: note: candidate template ignored: could not match 'basic_string_view' against 'basic_string'
    operator==(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/basic_string.h:6141:5: note: candidate template ignored: could not match 'basic_string<type-parameter-0-0, type-parameter-0-1, type-parameter-0-2>' against 'const char'
    operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/basic_string.h:6149:5: note: candidate template ignored: could not match 'basic_string<type-parameter-0-0, char_traits, allocator >' against 'const char'
    operator==(const basic_string<_CharT>& __lhs,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/basic_string.h:6163:5: note: candidate template ignored: could not match 'const _CharT ' against 'char'
    operator==(const _CharT
    __lhs,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/basic_string.h:6175:5: note: candidate template ignored: could not match 'basic_string<type-parameter-0-0, type-parameter-0-1, type-parameter-0-2>' against 'const char'
    operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/streambuf_iterator.h:208:5: note: candidate template ignored: could not match 'istreambuf_iterator<type-parameter-0-0, type-parameter-0-1>' against 'const char'
    operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/optional:983:5: note: candidate template ignored: could not match 'optional' against 'const char'
    operator==(const optional<_Tp>& __lhs, const optional<_Up>& __rhs)
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/optional:1034:5: note: candidate template ignored: could not match 'optional' against 'const char'
    operator==(const optional<_Tp>& __lhs, nullopt_t) noexcept
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/optional:1039:5: note: candidate template ignored: could not match 'optional' against 'basic_string'
    operator==(nullopt_t, const optional<_Tp>& __rhs) noexcept
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/optional:1095:5: note: candidate template ignored: could not match 'optional' against 'const char'
    operator==(const optional<_Tp>& __lhs, const _Up& __rhs)
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/optional:1101:5: note: candidate template ignored: could not match 'optional' against 'basic_string'
    operator==(const _Up& __lhs, const optional<_Tp>& __rhs)
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/array:252:5: note: candidate template ignored: could not match 'array<type-parameter-0-0, _Nm>' against 'const char'
    operator==(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/tuple:1419:5: note: candidate template ignored: could not match 'tuple<type-parameter-0-0...>' against 'const char'
    operator==(const tuple<_TElements...>& __t,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_map.h:1455:5: note: candidate template ignored: could not match 'map<type-parameter-0-0, type-parameter-0-1, type-parameter-0-2, type-parameter-0-3>' against 'const char'
    operator==(const map<_Key, _Tp, _Compare, _Alloc>& __x,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_multimap.h:1119:5: note: candidate template ignored: could not match 'multimap<type-parameter-0-0, type-parameter-0-1, type-parameter-0-2, type-parameter-0-3>' against 'const char'
    operator==(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_vector.h:1888:5: note: candidate template ignored: could not match 'vector<type-parameter-0-0, type-parameter-0-1>' against 'const char'
    operator==(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_deque.h:286:5: note: candidate template ignored: could not match '_Deque_iterator<type-parameter-0-0, type-parameter-0-1, type-parameter-0-2>' against 'const char'
    operator==(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_deque.h:293:5: note: candidate template ignored: could not match '_Deque_iterator<type-parameter-0-0, type-parameter-0-1, type-parameter-0-2>' against 'const char'
    operator==(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_deque.h:2312:5: note: candidate template ignored: could not match 'deque<type-parameter-0-0, type-parameter-0-1>' against 'const char'
    operator==(const deque<_Tp, _Alloc>& __x,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_stack.h:313:5: note: candidate template ignored: could not match 'stack<type-parameter-0-0, type-parameter-0-1>' against 'const char'
    operator==(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_list.h:1991:5: note: candidate template ignored: could not match 'list<type-parameter-0-0, type-parameter-0-1>' against 'const char'
    operator==(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/unique_ptr.h:715:5: note: candidate template ignored: could not match 'unique_ptr<type-parameter-0-0, type-parameter-0-1>' against 'const char'
    operator==(const unique_ptr<_Tp, _Dp>& __x,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/unique_ptr.h:721:5: note: candidate template ignored: could not match 'unique_ptr<type-parameter-0-0, type-parameter-0-1>' against 'const char'
    operator==(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/unique_ptr.h:726:5: note: candidate template ignored: could not match 'unique_ptr' against 'basic_string'
    operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/shared_ptr_base.h:1412:5: note: candidate template ignored: could not match '__shared_ptr<type-parameter-0-0, _Lp>' against 'const char'
    operator==(const __shared_ptr<_Tp1, _Lp>& __a,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/shared_ptr_base.h:1418:5: note: candidate template ignored: could not match '__shared_ptr<type-parameter-0-0, _Lp>' against 'const char'
    operator==(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/shared_ptr_base.h:1423:5: note: candidate template ignored: could not match '__shared_ptr' against 'basic_string'
    operator==(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/shared_ptr.h:383:5: note: candidate template ignored: could not match 'shared_ptr' against 'const char'
    operator==(const shared_ptr<_Tp>& __a, const shared_ptr<_Up>& __b) noexcept
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/shared_ptr.h:388:5: note: candidate template ignored: could not match 'shared_ptr' against 'const char'
    operator==(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/shared_ptr.h:393:5: note: candidate template ignored: could not match 'shared_ptr' against 'basic_string'
    operator==(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/std_function.h:746:5: note: candidate template ignored: could not match 'function<type-parameter-0-0 (type-parameter-0-1...)>' against 'const char'
    operator==(const function<_Res(_Args...)>& __f, nullptr_t) noexcept
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/std_function.h:752:5: note: candidate template ignored: could not match 'function' against 'basic_string'
    operator==(nullptr_t, const function<_Res(_Args...)>& __f) noexcept
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/unordered_map.h:2091:5: note: candidate template ignored: could not match 'unordered_map<type-parameter-0-0, type-parameter-0-1, type-parameter-0-2, type-parameter-0-3, type-parameter-0-4>' against 'const char'
    operator==(const unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/unordered_map.h:2103:5: note: candidate template ignored: could not match 'unordered_multimap<type-parameter-0-0, type-parameter-0-1, type-parameter-0-2, type-parameter-0-3, type-parameter-0-4>' against 'const char'
    operator==(const unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,
    ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stream_iterator.h:134:5: note: candidate template ignored: could not match 'istream_iterator<type-parameter-0-0, type-parameter-0-1, type-parameter-0-2, type-parameter-0-3>' against 'const char'
    operator==(const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __x,
    ^
    1 error generated. '''

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