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Util: Implement copy-and-swap idiom and the Rule of Five in Value

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Riyyi
2022-07-16 00:51:32 +02:00
parent a1bb1b93c9
commit 3e69abdfa0
5 changed files with 131 additions and 92 deletions
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src/util/json/value.cpp
+96 -65
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@@ -9,7 +9,7 @@
#include <cstdint> // uint32_t
#include <iostream> // istream, ostream
#include <string>
#include <utility> // move
#include <utility> // move, swap
#include "util/json/array.h"
#include "util/json/job.h"
@@ -27,7 +27,26 @@ Value::Value(std::nullptr_t)
Value::Value(Type type)
: m_type(type)
{
create();
switch (m_type) {
case Type::Bool:
m_value.boolean = false;
break;
case Type::Number:
m_value.number = 0.0;
break;
case Type::String:
m_value.string = new std::string;
break;
case Type::Array:
m_value.array = new Array;
break;
case Type::Object:
m_value.object = new Object;
break;
case Type::Null:
default:
break;
}
}
Value::Value(const std::initializer_list<Value>& values)
@@ -48,36 +67,94 @@ Value::Value(const std::initializer_list<Value>& values)
for (auto& value : values) {
m_value.object->emplace(std::move(*value[0].m_value.string),
std::move(value[1]));
std::move(value[1]));
}
}
}
// Copy constructor
Value::Value(const Value& other)
: m_type(other.m_type)
{
copyFrom(other);
switch (m_type) {
case Type::Bool:
m_value.boolean = other.m_value.boolean;
break;
case Type::Number:
m_value.number = other.m_value.number;
break;
case Type::String:
m_value.string = new std::string(*other.m_value.string);
break;
case Type::Array:
m_value.array = new Array(*other.m_value.array);
break;
case Type::Object:
m_value.object = new Object(*other.m_value.object);
break;
case Type::Null:
default:
break;
}
}
// Assignment operator
Value& Value::operator=(const Value& other)
// Move constructor
Value::Value(Value&& other) noexcept
: Value(Type::Null) // Initialize via default construction
{
if (this != &other) {
clear();
copyFrom(other);
}
// Allow std::swap as a fallback on ADL failure
using std::swap;
// Unqualified call to swap, allow ADL to operate and find best match
swap(*this, other);
}
// Copy assignment
// Move assignment
Value& Value::operator=(Value other)
{
// Allow std::swap as a fallback on ADL failure
using std::swap;
// Unqualified call to swap, allow ADL to operate and find best match
swap(*this, other);
return *this;
}
void swap(Value& left, Value& right) noexcept
{
std::swap(left.m_type, right.m_type);
std::swap(left.m_value, right.m_value);
}
// ------------------------------------------
void Value::clear()
{
switch (m_type) {
case Type::Bool:
m_value.boolean = false;
break;
case Type::Number:
m_value.number = 0.0;
break;
case Type::String:
m_value.string->clear();
break;
case Type::Array:
m_value.array->clear();
break;
case Type::Object:
m_value.object->clear();
break;
case Type::Null:
default:
break;
}
}
Value Value::parse(const std::string& input)
{
Job job(input);
Value value = job.fire();
return value;
return Job(input).fire();
}
std::string Value::dump(const uint32_t indent, const char indentCharacter) const
@@ -190,14 +267,13 @@ size_t Value::size() const
switch (m_type) {
case Type::Null:
return 0;
case Type::Bool:
case Type::Number:
case Type::String:
return 1;
case Type::Array:
return m_value.array->size();
case Type::Object:
return m_value.object->size();
case Type::Bool:
case Type::Number:
case Type::String:
default:
return 1;
}
@@ -205,30 +281,7 @@ size_t Value::size() const
// ------------------------------------------
void Value::create()
{
switch (m_type) {
case Type::Bool:
m_value.boolean = false;
break;
case Type::Number:
m_value.number = 0.0;
break;
case Type::String:
m_value.string = new std::string;
break;
case Type::Array:
m_value.array = new Array;
break;
case Type::Object:
m_value.object = new Object;
break;
default:
break;
}
}
void Value::clear()
void Value::destroy()
{
switch (m_type) {
case Type::String:
@@ -240,31 +293,9 @@ void Value::clear()
case Type::Object:
delete m_value.object;
break;
default:
break;
}
}
void Value::copyFrom(const Value& other)
{
m_type = other.m_type;
switch (m_type) {
case Type::Null:
case Type::Bool:
m_value.boolean = other.m_value.boolean;
break;
case Type::Number:
m_value.number = other.m_value.number;
break;
case Type::String:
m_value.string = new std::string(*other.m_value.string);
break;
case Type::Array:
m_value.array = new Array(*other.m_value.array);
break;
case Type::Object:
m_value.object = new Object(*other.m_value.object);
break;
default:
break;
}