【Boost】boost::to_upper_copy詳解

boost::to_upper_copy有兩種構造函數，特別是第二種，注意boost::range的使用。

函數形式：

template<typename OutputIteratorT, typename RangeT> 
OutputIteratorT 
to_upper_copy(OutputIteratorT Output, const RangeT & Input, 
const std::locale & Loc = std::locale()); 
template<typename SequenceT> 
SequenceT to_upper_copy(const SequenceT & Input, 
const std::locale & Loc = std::locale()); 

例子：

// to_upper_copy兩種重載函數 
void test_string_upper() 
{ 
    std::string str1 = "Hello world!"; 
 
    // 方法1 
    std::string str2 = boost::to_upper_copy(str1); 
    assert(str2 == "HELLO WORLD!"); 
 
    // 方法2, 第二個參數是range, 可以是如下幾種類型 
    // 1. make_pire(iterator, iterator) 
    // 2. std::string 
    // 3. 數組 
    std::string str3 = "str3 = "; 
    boost::to_upper_copy(std::back_inserter(str3), std::make_pair(str1.begin(), str1.end())); 
    assert(str3 == "str3 = HELLO WORLD!"); 
 
    std::string str4 = "str4 = "; 
    boost::to_upper_copy(std::back_inserter(str4), "HELLO WORLD!"); 
    assert(str4 == "str4 = HELLO WORLD!"); 
 
    std::string str5 = "str5 = "; 
    boost::to_upper_copy(std::back_inserter(str5), boost::make_iterator_range(str1)); 
    assert(str5 == "str5 = HELLO WORLD!"); 
 
    std::string str6 = "str6 = "; 
    char* p = "HELLO WORLD!"; 
    boost::to_upper_copy(std::back_inserter(str6), p); 
    assert(str6 == "str6 = HELLO WORLD!"); 
}