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Make String move constructor move instead of copy.#21

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Merged
aentinger merged 2 commits intoarduino:masterfromleg0:proper_string_move
May 25, 2021
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48 changes: 18 additions & 30 deletionsapi/String.cpp
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Original file line numberDiff line numberDiff line change
Expand Up@@ -65,14 +65,13 @@ String::String(const __FlashStringHelper *pstr)

#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
String::String(String &&rval)
: buffer(rval.buffer)
, capacity(rval.capacity)
, len(rval.len)
{
init();
move(rval);
}
String::String(StringSumHelper &&rval)
{
init();
move(rval);
rval.buffer = NULL;
rval.capacity = 0;
rval.len = 0;
}
#endif

Expand DownExpand Up@@ -217,23 +216,18 @@ String & String::copy(const __FlashStringHelper *pstr, unsigned int length)
#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
void String::move(String &rhs)
{
if (buffer) {
if (rhs && capacity >= rhs.len) {
memcpy(buffer, rhs.buffer, rhs.len);
len = rhs.len;
buffer[len] = '\0';
rhs.len = 0;
return;
} else {
free(buffer);
}
if (this != &rhs)
{
free(buffer);

buffer = rhs.buffer;
len = rhs.len;
capacity = rhs.capacity;

rhs.buffer = NULL;
rhs.len = 0;
rhs.capacity = 0;
}
buffer = rhs.buffer;
capacity = rhs.capacity;
len = rhs.len;
rhs.buffer = NULL;
rhs.capacity = 0;
rhs.len = 0;
}
#endif

Expand All@@ -250,13 +244,7 @@ String & String::operator = (const String &rhs)
#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
String & String::operator = (String &&rval)
{
if (this != &rval) move(rval);
return *this;
}

String & String::operator = (StringSumHelper &&rval)
{
if (this != &rval) move(rval);
move(rval);
return *this;
}
#endif
Expand Down
2 changes: 0 additions & 2 deletionsapi/String.h
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Original file line numberDiff line numberDiff line change
Expand Up@@ -74,7 +74,6 @@ class String
String(const __FlashStringHelper *str);
#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
String(String &&rval);
String(StringSumHelper &&rval);
#endif
explicit String(char c);
explicit String(unsigned char, unsigned char base=10);
Expand All@@ -101,7 +100,6 @@ class String
String & operator = (const __FlashStringHelper *str);
#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
String & operator = (String &&rval);
String & operator = (StringSumHelper &&rval);
#endif

// concatenate (works w/ built-in types)
Expand Down
1 change: 1 addition & 0 deletionstest/CMakeLists.txt
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Original file line numberDiff line numberDiff line change
Expand Up@@ -66,6 +66,7 @@ set(TEST_SRCS
src/String/test_indexOf.cpp
src/String/test_lastIndexOf.cpp
src/String/test_length.cpp
src/String/test_move.cpp
src/String/test_remove.cpp
src/String/test_replace.cpp
src/String/test_String.cpp
Expand Down
37 changes: 37 additions & 0 deletionstest/src/String/test_move.cpp
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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,37 @@
#include <catch.hpp>

#include <String.h>

#include "StringPrinter.h"

#include <utility>

TEST_CASE("Testing String move constructor", "[String-move-01]")
{
arduino::String a("src");
char const* const a_str = a.c_str();
arduino::String b(std::move(a));
REQUIRE(a.length() == 0);
REQUIRE(a.c_str() == nullptr);
REQUIRE(b.c_str() == a_str);
REQUIRE(b.length() == 3);
}

TEST_CASE("Testing String move assignment", "[String-move-02]")
{
arduino::String a("src");
char const* const a_str = a.c_str();
arduino::String b;
b = std::move(a);
REQUIRE(a.length() == 0);
REQUIRE(a.c_str() == nullptr);
REQUIRE(b == arduino::String("src"));
REQUIRE(b.c_str() == a_str);
}

TEST_CASE("Testing String move self assignment", "[String-move-03]")
{
arduino::String a("src");
a = std::move(a);
REQUIRE(a == "src");
}

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