unsigned lastUsed;
};
- // notice that we must use an accessor function and not a static variable
- // because when the TLS variables support is implemented in the library (and
- // not by the compiler), the global s_cache variable could be not yet
- // initialized when a ctor of another global object is executed and if that
- // ctor uses any wxString methods, bad things happen
+#ifndef wxHAS_COMPILER_TLS
+ // we must use an accessor function and not a static variable when the TLS
+ // variables support is implemented in the library (and not by the compiler)
+ // because the global s_cache variable could be not yet initialized when a
+ // ctor of another global object is executed and if that ctor uses any
+ // wxString methods, bad things happen
//
- // also note that for the same reason this function _is_ MT-safe: we know
- // it's going to be called during the program startup (currently during
- // globals initialization but even if they ever stop using wxString, it would
- // still be called by wxInitialize()), i.e. before any threads are created
- static Cache& GetCache()
+ // however notice that this approach does not work when compiler TLS is used,
+ // at least not with g++ 4.1.2 under amd64 as it apparently compiles code
+ // using this accessor incorrectly when optimizations are enabled (-O2 is
+ // enough) -- luckily we don't need it then neither as static __thread
+ // variables are initialized by 0 anyhow then and so we can use the variable
+ // directly
+ WXEXPORT static Cache& GetCache()
{
static wxTLS_TYPE(Cache) s_cache;
return wxTLS_VALUE(s_cache);
}
+
+ // this helper struct is used to ensure that GetCache() is called during
+ // static initialization time, i.e. before any threads creation, as otherwise
+ // the static s_cache construction inside GetCache() wouldn't be MT-safe
+ friend struct wxStrCacheInitializer;
+#else // wxHAS_COMPILER_TLS
+ static wxTLS_TYPE(Cache) ms_cache;
+ static Cache& GetCache() { return wxTLS_VALUE(ms_cache); }
+#endif // !wxHAS_COMPILER_TLS/wxHAS_COMPILER_TLS
static Cache::Element *GetCacheBegin() { return GetCache().cached; }
static Cache::Element *GetCacheEnd() { return GetCacheBegin() + Cache::SIZE; }
static unsigned& LastUsedCacheElement() { return GetCache().lastUsed; }
+ // this is used in debug builds only to provide a convenient function,
+ // callable from a debugger, to show the cache contents
friend struct wxStrCacheDumper;
// uncomment this to have access to some profiling statistics on program
lenhits; // number of cache hits in length()
} ms_cacheStats;
- friend struct ShowCacheStats;
+ friend struct wxStrCacheStatsDumper;
#define wxCACHE_PROFILE_FIELD_INC(field) ms_cacheStats.field++
#define wxCACHE_PROFILE_FIELD_ADD(field, val) ms_cacheStats.field += (val)
// profiling seems to show a small but consistent gain if we use this
// simple loop instead of starting from the last used element (there are
// a lot of misses in this function...)
- for ( Cache::Element *c = GetCacheBegin(); c != GetCacheEnd(); c++ )
+ Cache::Element * const cacheBegin = GetCacheBegin();
+#ifndef wxHAS_COMPILER_TLS
+ // during destruction tls calls may return NULL, in this case return NULL
+ // immediately without accessing anything else
+ if ( cacheBegin == NULL )
+ return NULL;
+#endif
+ Cache::Element * const cacheEnd = GetCacheEnd();
+ for ( Cache::Element *c = cacheBegin; c != cacheEnd; c++ )
{
if ( c->str == this )
return c;
// used for length caching only so far, i.e. it doesn't count as a hit
// from our point of view
if ( cache->pos )
+ {
wxCACHE_PROFILE_FIELD_INC(poshits);
+ }
if ( pos == cache->pos )
return cache->impl;
iterator(wxString *str, underlying_iterator ptr)
: m_cur(ptr), m_node(str, &m_cur) {}
- wxString* str() const { return wx_const_cast(wxString*, m_node.m_str); }
+ wxString* str() const { return const_cast<wxString*>(m_node.m_str); }
wxStringIteratorNode m_node;
// truncate the string to given length
wxString& Truncate(size_t uiLen);
// empty string contents
- void Empty()
- {
- Truncate(0);
-
- wxASSERT_MSG( empty(), _T("string not empty after call to Empty()?") );
- }
+ void Empty() { clear(); }
// empty the string and free memory
void Clear() { clear(); }
{ return at(n); }
#endif // size_t != unsigned int
- // explicit conversion to C string (use this with printf()!)
+
+ /*
+ Overview of wxString conversions, implicit and explicit:
+
+ - wxString has a std::[w]string-like c_str() method, however it does
+ not return a C-style string directly but instead returns wxCStrData
+ helper object which is convertible to either "char *" narrow string
+ or "wchar_t *" wide string. Usually the correct conversion will be
+ applied by the compiler automatically but if this doesn't happen you
+ need to explicitly choose one using wxCStrData::AsChar() or AsWChar()
+ methods or another wxString conversion function.
+
+ - One of the places where the conversion does *NOT* happen correctly is
+ when c_str() is passed to a vararg function such as printf() so you
+ must *NOT* use c_str() with them. Either use wxPrintf() (all wx
+ functions do handle c_str() correctly, even if they appear to be
+ vararg (but they're not, really)) or add an explicit AsChar() or, if
+ compatibility with previous wxWidgets versions is important, add a
+ cast to "const char *".
+
+ - In non-STL mode only, wxString is also implicitly convertible to
+ wxCStrData. The same warning as above applies.
+
+ - c_str() is polymorphic as it can be converted to either narrow or
+ wide string. If you explicitly need one or the other, choose to use
+ mb_str() (for narrow) or wc_str() (for wide) instead. Notice that
+ these functions can return either the pointer to string directly (if
+ this is what the string uses internally) or a temporary buffer
+ containing the string and convertible to it. Again, conversion will
+ usually be done automatically by the compiler but beware of the
+ vararg functions: you need an explicit cast when using them.
+
+ - There are also non-const versions of mb_str() and wc_str() called
+ char_str() and wchar_str(). They are only meant to be used with
+ non-const-correct functions and they always return buffers.
+
+ - Finally wx_str() returns whatever string representation is used by
+ wxString internally. It may be either a narrow or wide string
+ depending on wxWidgets build mode but it will always be a raw pointer
+ (and not a buffer).
+ */
+
+ // explicit conversion to wxCStrData
wxCStrData c_str() const { return wxCStrData(this); }
wxCStrData data() const { return c_str(); }
- // implicit conversion to C string
+ // implicit conversion to wxCStrData
operator wxCStrData() const { return c_str(); }
// the first two operators conflict with operators for conversion to
wxString Left(size_t nCount) const;
// get last nCount characters
wxString Right(size_t nCount) const;
- // get all characters before the first occurance of ch
+ // get all characters before the first occurrence of ch
// (returns the whole string if ch not found)
wxString BeforeFirst(wxUniChar ch) const;
- // get all characters before the last occurence of ch
+ // get all characters before the last occurrence of ch
// (returns empty string if ch not found)
wxString BeforeLast(wxUniChar ch) const;
- // get all characters after the first occurence of ch
+ // get all characters after the first occurrence of ch
// (returns empty string if ch not found)
wxString AfterFirst(wxUniChar ch) const;
- // get all characters after the last occurence of ch
+ // get all characters after the last occurrence of ch
// (returns the whole string if ch not found)
wxString AfterLast(wxUniChar ch) const;
int Find(const wxWCharBuffer& sub) const
{ return Find(sub.data()); }
- // replace first (or all of bReplaceAll) occurences of substring with
+ // replace first (or all of bReplaceAll) occurrences of substring with
// another string, returns the number of replacements made
size_t Replace(const wxString& strOld,
const wxString& strNew,
size_t find(const wxCStrData& s, size_t nStart = 0, size_t n = npos) const
{ return find(s.AsWChar(), nStart, n); }
- // find the first occurence of character ch after nStart
+ // find the first occurrence of character ch after nStart
size_t find(wxUniChar ch, size_t nStart = 0) const
{
#if wxUSE_UNICODE_UTF8
size_t rfind(wchar_t ch, size_t nStart = npos) const
{ return rfind(wxUniChar(ch), nStart); }
- // find first/last occurence of any character (not) in the set:
+ // find first/last occurrence of any character (not) in the set:
#if wxUSE_STL_BASED_WXSTRING && !wxUSE_UNICODE_UTF8
// FIXME-UTF8: this is not entirely correct, because it doesn't work if
// sizeof(wchar_t)==2 and surrogates are present in the string;
size_t find_last_of(wxUniChar c, size_t nStart = npos) const
{ return rfind(c, nStart); }
- // find first/last occurence of any character not in the set
+ // find first/last occurrence of any character not in the set
// as strspn() (starting from nStart), returns npos on failure
size_t find_first_not_of(const wxString& str, size_t nStart = 0) const
#endif // !wxUSE_STL_BASED_WXSTRING
template<typename T>
-class WXDLLIMPEXP_BASE wxStringTypeBufferBase
+class wxStringTypeBufferBase
{
public:
typedef T CharType;
};
template<typename T>
-class WXDLLIMPEXP_BASE wxStringTypeBufferLengthBase
- : public wxStringTypeBufferBase<T>
+class wxStringTypeBufferLengthBase : public wxStringTypeBufferBase<T>
{
public:
wxStringTypeBufferLengthBase(wxString& str, size_t lenWanted = 1024)
WXDLLIMPEXP_TEMPLATE_INSTANCE_BASE( wxStringTypeBufferBase<char> )
-class WXDLLIMPEXP_BASE wxUTF8StringBuffer : public wxStringTypeBufferBase<char>
+// Note about inlined dtors in the classes below: this is done not for
+// performance reasons but just to avoid linking errors in the MSVC DLL build
+// under Windows: if a class has non-inline methods it must be declared as
+// being DLL-exported but, due to an extremely interesting feature of MSVC 7
+// and later, any template class which is used as a base of a DLL-exported
+// class is implicitly made DLL-exported too, as explained at the bottom of
+// http://msdn.microsoft.com/en-us/library/twa2aw10.aspx (just to confirm: yes,
+// _inheriting_ from a class can change whether it is being exported from DLL)
+//
+// But this results in link errors because the base template class is not DLL-
+// exported, whether it is declared with WXDLLIMPEXP_BASE or not, because it
+// does have only inline functions. So the simplest fix is to just make all the
+// functions of these classes inline too.
+
+class wxUTF8StringBuffer : public wxStringTypeBufferBase<char>
{
public:
wxUTF8StringBuffer(wxString& str, size_t lenWanted = 1024)
: wxStringTypeBufferBase<char>(str, lenWanted) {}
- ~wxUTF8StringBuffer();
+ ~wxUTF8StringBuffer()
+ {
+ wxMBConvStrictUTF8 conv;
+ size_t wlen = conv.ToWChar(NULL, 0, m_buf);
+ wxCHECK_RET( wlen != wxCONV_FAILED, "invalid UTF-8 data in string buffer?" );
+
+ wxStringInternalBuffer wbuf(m_str, wlen);
+ conv.ToWChar(wbuf, wlen, m_buf);
+ }
DECLARE_NO_COPY_CLASS(wxUTF8StringBuffer)
};
WXDLLIMPEXP_TEMPLATE_INSTANCE_BASE( wxStringTypeBufferLengthBase<char> )
-class WXDLLIMPEXP_BASE wxUTF8StringBufferLength
- : public wxStringTypeBufferLengthBase<char>
+class wxUTF8StringBufferLength : public wxStringTypeBufferLengthBase<char>
{
public:
wxUTF8StringBufferLength(wxString& str, size_t lenWanted = 1024)
: wxStringTypeBufferLengthBase<char>(str, lenWanted) {}
- ~wxUTF8StringBufferLength();
+ ~wxUTF8StringBufferLength()
+ {
+ wxCHECK_RET(m_lenSet, "length not set");
+
+ wxMBConvStrictUTF8 conv;
+ size_t wlen = conv.ToWChar(NULL, 0, m_buf, m_len);
+ wxCHECK_RET( wlen != wxCONV_FAILED, "invalid UTF-8 data in string buffer?" );
+
+ wxStringInternalBufferLength wbuf(m_str, wlen);
+ conv.ToWChar(wbuf, wlen, m_buf, m_len);
+ wbuf.SetLength(wlen);
+ }
DECLARE_NO_COPY_CLASS(wxUTF8StringBufferLength)
};
inline wxCStrData::~wxCStrData()
{
if ( m_owned )
- delete wx_const_cast(wxString*, m_str); // cast to silence warnings
+ delete const_cast<wxString*>(m_str); // cast to silence warnings
}
// simple cases for AsChar() and AsWChar(), the complicated ones are
if ( str )
{
m_next = str->m_iterators.ptr;
- wx_const_cast(wxString*, m_str)->m_iterators.ptr = this;
+ const_cast<wxString*>(m_str)->m_iterators.ptr = this;
if ( m_next )
m_next->m_prev = this;
}
if ( m_prev )
m_prev->m_next = m_next;
else if ( m_str ) // first in the list
- wx_const_cast(wxString*, m_str)->m_iterators.ptr = m_next;
+ const_cast<wxString*>(m_str)->m_iterators.ptr = m_next;
m_next = m_prev = NULL;
m_citer = NULL;
projects / wxWidgets.git / blobdiff