godot/core/string_builder.h
Karroffel 95a0886f93 added StringBuilder class
When doing large string concatenations the default push_back on the
String class can slow down things quite a bit. This is because it
has to constantly reallocate the memory and copy the contents. This
StringBuilder class delays the concatenation until the size of the
resulting string is known.
2017-09-01 19:52:32 +02:00

80 lines
3.1 KiB
C++

/*************************************************************************/
/* string_builder.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifndef STRING_BUILDER_H
#define STRING_BUILDER_H
#include "core/ustring.h"
#include "core/vector.h"
class StringBuilder {
uint32_t string_length = 0;
Vector<String> strings;
Vector<const char *> c_strings;
// -1 means it's a Godot String
// a natural number means C string.
Vector<int32_t> appended_strings;
public:
StringBuilder &append(const String &p_string);
StringBuilder &append(const char *p_cstring);
_FORCE_INLINE_ StringBuilder &operator+(const String &p_string) {
return append(p_string);
}
_FORCE_INLINE_ StringBuilder &operator+(const char *p_cstring) {
return append(p_cstring);
}
_FORCE_INLINE_ void operator+=(const String &p_string) {
append(p_string);
}
_FORCE_INLINE_ void operator+=(const char *p_cstring) {
append(p_cstring);
}
_FORCE_INLINE_ int num_strings_appended() const {
return appended_strings.size();
}
String as_string() const;
_FORCE_INLINE_ operator String() const {
return as_string();
}
};
#endif // STRING_BUILDER_H