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#ifndef _GLIBMM_UTILITY_H
#define _GLIBMM_UTILITY_H
/* Copyright 2002 The gtkmm Development Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <glibmmconfig.h>
#include <glibmm/ustring.h>
#include <glib.h>
#include <memory> //For std::unique_ptr.
#ifndef DOXYGEN_SHOULD_SKIP_THIS
#ifndef GLIBMM_DISABLE_DEPRECATED
/* Occasionally, a struct variable has to be initialized after its definition,
* i.e. when using structs as class member data. For convenience, the macro
* GLIBMM_INITIALIZE_STRUCT(Var, Type) is provided. It even avoids creating
* a temporary if the compiler is GCC.
*
* @deprecated Use e.g. std::memset() instead.
* It's not used any more in the code generated by _CLASS_BOXEDTYPE_STATIC.
* It generates compiler warnings if __STRICT_ANSI__ is defined.
*/
#if ((__GNUC__ >= 3) || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)) && !defined(__STRICT_ANSI__)
#define GLIBMM_INITIALIZE_STRUCT(Var, Type) __builtin_memset(&(Var), 0, sizeof(Type))
#else
// TODO: This causes warnings like this:
//"missing initializer for member"
#define GLIBMM_INITIALIZE_STRUCT(Var, Type) \
G_STMT_START \
{ \
Type const temp_initializer__ = { \
0, \
}; \
(Var) = temp_initializer__; \
} \
G_STMT_END
#endif
#endif // GLIBMM_DISABLE_DEPRECATED
namespace Glib
{
// These are used by gmmproc-generated type conversions:
#ifndef GLIBMM_DISABLE_DEPRECATED
/** Helper to deal with memory allocated
* by GLib functions in an exception-safe manner.
*
* @deprecated Use make_unique_ptr_gfree() instead.
*/
template <typename T>
class ScopedPtr
{
private:
T* ptr_;
ScopedPtr(const ScopedPtr<T>&);
ScopedPtr<T>& operator=(const ScopedPtr<T>&);
public:
ScopedPtr() : ptr_(nullptr) {}
explicit ScopedPtr(T* ptr) : ptr_(ptr) {}
~ScopedPtr() noexcept { g_free(ptr_); }
T* get() const { return ptr_; }
T** addr() { return &ptr_; }
};
#endif // GLIBMM_DISABLE_DEPRECATED
/** Helper to deal with memory allocated
* by GLib functions in an exception-safe manner.
*
* This just creates a std::unique_ptr that uses g_free() as its deleter.
*/
template <typename T>
std::unique_ptr<T[], decltype(&g_free)>
make_unique_ptr_gfree(T* p)
{
return std::unique_ptr<T[], decltype(&g_free)>(p, &g_free);
}
// TODO: Deprecate this? We don't use it ourselves.
/** Removes the const nature of a ptr
*
*/
template <class T>
inline T*
unconst(const T* t)
{
return const_cast<T*>(t);
}
// Convert const gchar* to ustring, while treating NULL as empty string.
inline Glib::ustring
convert_const_gchar_ptr_to_ustring(const char* str)
{
return (str) ? Glib::ustring(str) : Glib::ustring();
}
// Convert const gchar* to std::string, while treating NULL as empty string.
inline std::string
convert_const_gchar_ptr_to_stdstring(const char* str)
{
return (str) ? std::string(str) : std::string();
}
// Convert a non-const gchar* return value to ustring, freeing it too.
inline Glib::ustring
convert_return_gchar_ptr_to_ustring(char* str)
{
return (str) ? Glib::ustring(Glib::make_unique_ptr_gfree(str).get()) : Glib::ustring();
}
// Convert a non-const gchar* return value to std::string, freeing it too.
inline std::string
convert_return_gchar_ptr_to_stdstring(char* str)
{
return (str) ? std::string(Glib::make_unique_ptr_gfree(str).get()) : std::string();
}
/** Get a pointer to the C style string in a std::string or Glib::ustring.
* If the string is empty, a nullptr is returned.
*/
template <typename T>
inline const char*
c_str_or_nullptr(const T& str)
{
return str.empty() ? nullptr : str.c_str();
}
// Append type_name to dest, while replacing special characters with '+'.
void append_canonical_typename(std::string& dest, const char* type_name);
// Delete data referred to by a void*.
// Instantiations can be used as destroy callbacks in glib functions
// that take a GDestroyNotify parameter, such as g_object_set_qdata_full()
// and g_option_group_set_translate_func().
template <typename T>
void
destroy_notify_delete(void* data)
{
delete static_cast<T*>(data);
}
// Conversion between different types of function pointers with
// reinterpret_cast can make gcc8 print a warning.
// https://github.com/libsigcplusplus/libsigcplusplus/issues/1
/** Returns the supplied bit pattern, interpreted as another type.
*
* When reinterpret_cast causes a compiler warning or error, this function
* may work. Intended mainly for conversion between different types of pointers.
*/
template <typename T_out, typename T_in>
inline T_out bitwise_equivalent_cast(T_in in)
{
union {
T_in in;
T_out out;
} u;
u.in = in;
return u.out;
}
} // namespace Glib
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
#endif /* _GLIBMM_UTILITY_H */
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