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#ifndef VTZERO_PROPERTY_HPP
#define VTZERO_PROPERTY_HPP
/*****************************************************************************
vtzero - Tiny and fast vector tile decoder and encoder in C++.
This file is from https://github.com/mapbox/vtzero where you can find more
documentation.
*****************************************************************************/
/**
* @file property.hpp
*
* @brief Contains the property class.
*/
#include "property_value.hpp"
#include "types.hpp"
namespace vtzero {
/**
* A view of a vector tile property (key and value).
*
* Doesn't hold any data itself, just views of the key and value.
*/
class property {
data_view m_key{};
property_value m_value{};
public:
/**
* The default constructor creates an invalid (empty) property.
*/
constexpr property() noexcept = default;
/**
* Create a (valid) property from a key and value.
*/
constexpr property(const data_view key, const property_value value) noexcept :
m_key(key),
m_value(value) {
}
/**
* Is this a valid property? Properties are valid if they were
* constructed using the non-default constructor.
*/
constexpr bool valid() const noexcept {
return m_key.data() != nullptr;
}
/**
* Is this a valid property? Properties are valid if they were
* constructed using the non-default constructor.
*/
explicit constexpr operator bool() const noexcept {
return valid();
}
/// Return the property key.
constexpr data_view key() const noexcept {
return m_key;
}
/// Return the property value.
constexpr property_value value() const noexcept {
return m_value;
}
}; // class property
/// properties are equal if they contain the same key & value data.
inline constexpr bool operator==(const property& lhs, const property& rhs) noexcept {
return lhs.key() == rhs.key() && lhs.value() == rhs.value();
}
/// properties are unequal if they do not contain them same key and value data.
inline constexpr bool operator!=(const property& lhs, const property& rhs) noexcept {
return !(lhs == rhs);
}
} // namespace vtzero
#endif // VTZERO_PROPERTY_HPP
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