remove JSONCPP_OP_EXPLICIT

This codebase in C++11. No need for compatibility with C++98.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Author: neheb

include/json/config.h

@@ -76,16 +76,12 @@ extern JSON_API int msvc_pre1900_c99_snprintf(char* outBuf, size_t size,
 
 #if __cplusplus >= 201103L
 #define JSONCPP_NOEXCEPT noexcept
-#define JSONCPP_OP_EXPLICIT explicit
 #elif defined(_MSC_VER) && _MSC_VER < 1900
 #define JSONCPP_NOEXCEPT throw()
-#define JSONCPP_OP_EXPLICIT explicit
 #elif defined(_MSC_VER) && _MSC_VER >= 1900
 #define JSONCPP_NOEXCEPT noexcept
-#define JSONCPP_OP_EXPLICIT explicit
 #else
 #define JSONCPP_NOEXCEPT throw()
-#define JSONCPP_OP_EXPLICIT
 #endif
 
 #ifdef __clang__

include/json/value.h

@@ -421,7 +421,7 @@ class JSON_API Value {
   bool empty() const;
 
   /// Return !isNull()
-  JSONCPP_OP_EXPLICIT operator bool() const;
+  explicit operator bool() const;
 
   /// Remove all object members and array elements.
   /// \pre type() is arrayValue, objectValue, or nullValue