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Add a base class with specialization to QStringBuilder.

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This will allow separation of API that should work with QString
results, and API that should work with QByteArray results.

Change-Id: I5be398188abd421bb5056cea2658ea85fc03aa4f
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
This commit is contained in:
Stephen Kelly 2012-02-29 12:25:01 +01:00 committed by Qt by Nokia
parent 3ca168d6fe
commit 84ef7704a8
1 changed files with 38 additions and 12 deletions
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50
src/corelib/tools/qstringbuilder.h
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@ -42,6 +42,12 @@
#ifndef QSTRINGBUILDER_H
#define QSTRINGBUILDER_H
#if 0
// syncqt can not handle the templates in this file, and it doesn't need to
// process them anyway because they are internal.
#pragma qt_sync_stop_processing
#endif
#include <QtCore/qstring.h>
#include <QtCore/qbytearray.h>
@ -64,8 +70,37 @@ protected:
template <typename T> struct QConcatenable {};
namespace QtStringBuilder {
template <typename A, typename B> struct ConvertToTypeHelper
{ typedef A ConvertTo; };
template <typename T> struct ConvertToTypeHelper<T, QString>
{ typedef QString ConvertTo; };
}
template<typename Builder, typename T>
struct QStringBuilderCommon
{
T toUpper() const { return resolved().toUpper(); }
T toLower() const { return resolved().toLower(); }
protected:
const T resolved() const { return *static_cast<const Builder*>(this); }
};
template<typename Builder, typename T>
struct QStringBuilderBase : public QStringBuilderCommon<Builder, T>
{
};
template<typename Builder>
struct QStringBuilderBase<Builder, QString> : public QStringBuilderCommon<Builder, QString>
{
QByteArray toLatin1() const { return this->resolved().toLatin1(); }
QByteArray toLocal8Bit() const { return this->resolved().toLocal8Bit(); }
};
template <typename A, typename B>
class QStringBuilder
class QStringBuilder : public QStringBuilderBase<QStringBuilder<A, B>, typename QtStringBuilder::ConvertToTypeHelper<typename QConcatenable<A>::ConvertTo, typename QConcatenable<B>::ConvertTo>::ConvertTo>
{
public:
QStringBuilder(const A &a_, const B &b_) : a(a_), b(b_) {}
@ -94,7 +129,6 @@ private:
public:
operator ConvertTo() const { return convertTo<ConvertTo>(); }
QByteArray toLatin1() const { return convertTo<QString>().toLatin1(); }
int size() const { return Concatenable::size(*this); }
const A &a;
@ -102,21 +136,20 @@ public:
};
template <>
class QStringBuilder <QString, QString>
class QStringBuilder <QString, QString> : public QStringBuilderBase<QStringBuilder<QString, QString>, QString>
{
public:
QStringBuilder(const QString &a_, const QString &b_) : a(a_), b(b_) {}
operator QString() const
{ QString r(a); r += b; return r; }
QByteArray toLatin1() const { return QString(*this).toLatin1(); }
const QString &a;
const QString &b;
};
template <>
class QStringBuilder <QByteArray, QByteArray>
class QStringBuilder <QByteArray, QByteArray> : public QStringBuilderBase<QStringBuilder<QByteArray, QByteArray>, QByteArray>
{
public:
QStringBuilder(const QByteArray &a_, const QByteArray &b_) : a(a_), b(b_) {}
@ -343,13 +376,6 @@ template <int N> struct QConcatenable<QStaticByteArrayDataPtr<N> > : private QAb
}
};
namespace QtStringBuilder {
template <typename A, typename B> struct ConvertToTypeHelper
{ typedef A ConvertTo; };
template <typename T> struct ConvertToTypeHelper<T, QString>
{ typedef QString ConvertTo; };
}
template <typename A, typename B>
struct QConcatenable< QStringBuilder<A, B> >
{