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interpret_value.cc
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interpret_value.cc
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// Copyright (c) 2019 ASMlover. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list ofconditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materialsprovided with the
// distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
#include "interpret_callable.hh"
#include "interpret_value.hh"
namespace loxcc::interpret {
template <typename... Ts> struct overloaded : Ts... { using Ts::operator()...; };
template <typename... Ts> overloaded(Ts...) -> overloaded<Ts...>;
bool Value::is_truthy(void) const {
return std::visit(overloaded {
[](nil_t) -> bool { return false; },
[](bool b) -> bool { return b; },
[](double d) -> bool { return d != 0.f; },
[](const str_t& s) -> bool { return !s.empty(); },
[](const CallablePtr&) -> bool { return true; },
[](const InstancePtr&) -> bool { return true; },
}, v_);
}
str_t Value::stringify(void) const {
return std::visit(overloaded {
[](nil_t) -> str_t { return "nil"; },
[](bool b) -> str_t { return b ? "true" : "false"; },
[](double d) -> str_t { return Xt::to_string(d); },
[](const str_t& s) -> str_t { return s; },
[](const CallablePtr& c) -> str_t { return c->stringify(); },
[](const InstancePtr& i) -> str_t { return i->stringify(); },
}, v_);
}
}