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Add templated accessors for C string

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This commit is contained in:
Milo Yip 2016-02-12 23:06:49 +08:00
commit 513fe7894e
2 changed files with 17 additions and 3 deletions
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15
include/rapidjson/document.h
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@ -401,7 +401,7 @@ namespace internal {
template <typename ValueType, typename T>
struct TypeHelper {
static bool Is(const ValueType&) { RAPIDJSON_ASSERT(false && "Unsupport type"); }
static T Get(const ValueType&) { RAPIDJSON_ASSERT(false && "Unsupport type"); }
static T Get(const ValueType&) { RAPIDJSON_ASSERT(false && "Unsupport type"); return T(); }
static ValueType& Set(ValueType&, T) { RAPIDJSON_ASSERT(false && "Unsupport type"); }
static ValueType& Set(ValueType&, T, typename ValueType::AllocatorType&) { RAPIDJSON_ASSERT(false && "Unsupport type"); }
};
@ -462,6 +462,15 @@ struct TypeHelper<ValueType, float> {
static ValueType& Set(ValueType& v, float data, typename ValueType::AllocatorType&) { return v.SetFloat(data); }
};
template<typename ValueType>
struct TypeHelper<ValueType, const typename ValueType::Ch*> {
typedef const typename ValueType::Ch* StringType;
static bool Is(const ValueType& v) { return v.IsString(); }
static StringType Get(const ValueType& v) { return v.GetString(); }
static ValueType& Set(ValueType& v, const StringType data) { return v.SetString(typename ValueType::StringRefType(data)); }
static ValueType& Set(ValueType& v, const StringType data, typename ValueType::AllocatorType& a) { return v.SetString(data, a); }
};
#if RAPIDJSON_HAS_STDSTRING
template<typename ValueType>
struct TypeHelper<ValueType, std::basic_string<typename ValueType::Ch> > {
@ -1561,10 +1570,10 @@ public:
RAPIDJSON_ASSERT((flags_ & kUint64Flag) != 0); return static_cast<double>(data_.n.u64); // uint64_t -> double (may lose precision)
}
//! Get the value as double type.
//! Get the value as float type.
/*! \note If the value is 64-bit integer type, it may lose precision. Use \c IsLosslessFloat() to check whether the converison is lossless.
*/
double GetFloat() const {
float GetFloat() const {
RAPIDJSON_ASSERT(IsFloat());
return static_cast<float>(GetDouble());
}

5
test/unittest/valuetest.cpp
View File

@ -768,6 +768,11 @@ TEST(Value, String) {
EXPECT_STREQ("World", w.GetString());
EXPECT_EQ(5u, w.GetStringLength());
// templated functions
EXPECT_TRUE(z.Is<const char*>());
EXPECT_STREQ(cstr, z.Get<const char*>());
EXPECT_STREQ("Apple", z.Set<const char*>("Apple").Get<const char*>());
#if RAPIDJSON_HAS_STDSTRING
{
std::string str = "Hello World";